COBOL (Common Business-Oriented Language) was designed in 1959 for developing business, typically finance-oriented, applications. Its syntax was designed to be English-like and self-documenting.

FORTRAN, an acronym for FORmula TRANslation, was indeed the programming language developed in the mid-1950s by a team led by John Backus at IBM. Its primary design goal was to efficiently execute scientific, mathematical, and engineering computations, making it the first widely successful high-level programming language for such applications.

COBOL (option A) was developed concurrently but focused on business data processing. LISP (option B) emerged slightly later and was designed for artificial intelligence and symbolic computation. ALGOL (option D) was developed as a universal algorithmic language but gained less commercial traction than FORTRAN in the scientific domain, especially in the US.

The IBM 650, introduced in 1954, stands out as a prominent first-generation computer due to its integral use of magnetic drum memory as its primary storage. This design choice was pivotal, as it offered a cost-effective and relatively reliable memory solution compared to other early technologies like vacuum tube-based memory or mercury delay lines, contributing significantly to its commercial success and widespread adoption. While ENIAC utilized vacuum tubes for arithmetic and storage, EDVAC and Colossus (which was a specialized code-breaking machine) also used different memory architectures. The magnetic drum gave the IBM 650 a distinct advantage in terms of affordability and robustness for business and scientific applications.

VisiCalc, created by Dan Bricklin and Bob Frankston, was the first spreadsheet program. Its release on the Apple II transformed the personal computer from a hobbyist's toy into a serious business tool.

COBOL (Common Business-Oriented Language) is structured to resemble natural English for business applications. [cite: 182]

The Commodore 64 (C64) achieved immense success due to its competitive pricing, advanced graphics, and superior sound capabilities for its era. These features made it highly appealing to a broad audience, leading to millions of units sold worldwide. Consequently, the C64 is officially recognized by Guinness World Records as the highest-selling single computer model of all time, making option (b) the correct answer. Option (a) is incorrect; the C64 used an 8-bit MOS Technology 6510 processor, not a 16-bit one. The Apple IIGS is an example of an early 16-bit home computer, released later in 1986. Option (c) is incorrect; hard disk drives were expensive and rare in home computers of that period, with the C64 primarily relying on floppy disk drives and cassette tapes for storage. Early computers with built-in hard drives were typically higher-end business machines. Option (d) is also incorrect; while the C64 had graphics capabilities, it primarily used a command-line interface. The Apple Macintosh, introduced in 1984, is widely credited with bringing the graphical user interface (GUI) to the mass market.

The Osborne 1 is widely recognized as the first commercially successful 'portable' computer. While it weighed a substantial 24.5 pounds (11.1 kg) and was often described as 'luggable' rather than truly portable by today's standards, it was groundbreaking for integrating the computer, monitor (a small 5-inch CRT display), two floppy disk drives, and a keyboard into a single, somewhat transportable unit. It also came bundled with a significant amount of business software, making it a complete solution for users on the go. It predated the modern laptop by several years and was distinct from stationary desktop computers or the later concept of tablet computers.

BASIC was developed at Dartmouth College by John G. Kemeny and Thomas E. Kurtz in 1964. Their primary goal was to create a programming language that was easy to learn and use, specifically for students in non-science fields who needed to access the college's time-sharing computer system. Before BASIC, programming required specialized knowledge, often deterring those outside of science and engineering. By making programming accessible to a broader audience, particularly undergraduates in disciplines like humanities and business, BASIC aimed to democratize access to computing. Its simplicity and user-friendliness were foundational to its later widespread adoption in the personal computer revolution.

VisiCalc, released in 1979 for the Apple II, was the very first electronic spreadsheet program available for personal computers. Often dubbed the 'killer application,' it transformed personal computers from mere enthusiast devices into indispensable tools for businesses and professionals. Its immense popularity was a major factor in the widespread adoption and success of the Apple II computer, demonstrating the practical utility of personal computing for tasks like financial modeling and data analysis. While Lotus 1-2-3 and Microsoft Excel later became dominant, VisiCalc pioneered the concept.

Minicomputers are indeed also known as 'mid-range computers.' They represented a class of multi-user computers that were more powerful and expensive than microcomputers (like personal computers), but less powerful and costly than large mainframe computers. Minicomputers gained prominence in the 1960s and 1970s, enabling smaller businesses and departments to afford computing power that was previously only accessible to large corporations and government entities with mainframes. Their role diminished with the rise of increasingly powerful and networked microcomputers in the 1980s and beyond. PDAs, laptops, and handheld computers are all types of microcomputers, designed for individual or portable use, and are significantly different in scale and capability from minicomputers.