Rival fits because it denotes a competing business that would look for opportunities to undermine or destroy him.

2006 — Twitter was launched in 2006, so 2006 is the correct answer.

IBM stands for International Business Machine, so International Business Machine is the correct answer.

Twitter was launched in 2006, which is the year the platform began operations.

The National Identity Card system was established under the National Registration Act in 1973 during the administration of Prime Minister Zulfikar Ali Bhutto.

At around age 12, Prophet Muhammad (PBUH) accompanied his uncle Abu Talib on a merchant caravan to Syria (al-Sham), where they met the monk Bahira at Busra.

In 2006, Dick Cheney was the incumbent Vice President of the United States, serving under President George W. Bush [1, p13]. Cheney held the office from January 20, 2001, to January 20, 2009. The provided PDF's answer key incorrectly marks (d) and its explanation is not relevant to the 2006 timeframe [1, p13].

In April 2006, the United States and South Korea formally requested observer status in SAARC. The SAARC Council of Ministers agreed in principle to grant this status to the US, South Korea, and the European Union in August 2006 [1, p13]. This marked an expansion of SAARC's engagement with global powers.

Angela Merkel became the Chancellor of Germany on November 22, 2005, and was serving in this capacity in 2006 [1, p13]. She was the first woman to hold the office and served for four terms.

Richard A. Boucher served as the U.S. Assistant Secretary of State for South and Central Asian Affairs from February 2006 to May 2009 [1, p12]. His tenure covered a significant period of diplomatic engagement in the region.