A debtor is an individual or entity that owes money to the business, typically arising from credit sales of goods or services. The debtor is expected to settle the obligation at a future date, and this amount is recorded as a current asset on the balance sheet.

Liabilities represent the financial claims against the assets of a business. This includes amounts owed to external creditors (external liabilities) and the capital invested by the proprietor (internal liability). According to the accounting equation, Assets = Liabilities + Equity, where liabilities encompass all such obligations.

According to modern accounting frameworks, an asset is a resource controlled by the entity as a result of past events and from which future economic benefits are expected to flow to the entity. Control is the essential criterion, as it allows the entity to restrict the access of others to the benefits of the resource, even if legal ownership is not held.

Bills receivable represent amounts owed to a business that are expected to be collected within a short period, typically within one year or the operating cycle. Therefore, they are classified as current assets on the balance sheet.

Any debt obligation that is expected to be settled within one year or the current operating cycle of the business is classified as a current liability. Even if the original loan was long-term, the portion maturing within the upcoming year must be reclassified from long-term liabilities to current liabilities to provide an accurate picture of the company's short-term liquidity requirements.

According to modern accounting frameworks, control is the essential criterion for asset recognition. A business must have the power to obtain future economic benefits from the resource and restrict others' access to those benefits. Legal ownership is not strictly required if the entity maintains effective control over the resource's use and the resulting economic inflows.

A liability is a financial obligation or debt that a business owes to external parties. Creditors are entities to whom the business owes money for goods or services purchased on credit. Cash, equipment, and debtors are classified as assets because they represent resources or future economic benefits for the business.

Plant assets, also known as fixed assets or property, plant, and equipment (PP&E), are long-term tangible assets used in the production or supply of goods and services. They are expected to provide economic benefits to the business for more than one accounting period.

The provided answer is B, but in standard accounting theory, debts owed by a business to its owner are classified as internal liabilities (Equity/Capital). External liabilities refer to debts owed to third parties like creditors or banks. This answer key appears to conflict with standard accounting definitions. The business entity concept treats the owner and the business as separate, making the owner's investment an internal obligation of the firm.

An asset is a resource controlled by an entity as a result of past events from which future economic benefits are expected to flow. Stocks of goods (inventory) represent current assets because they are held for sale in the ordinary course of business. Options A, B, and C represent liabilities, which are obligations to pay money or provide services to other parties.