The correct answer is B. Bond.

A bond is a fixed income instrument issued by a government or corporation. It is a loan that the issuer promises to repay with interest over a specified period of time. Bonds are typically used to raise money for large projects, such as building a new factory or infrastructure.

Shares, on the other hand, are a type of equity security that represents ownership in a company. When you buy shares, you become a part-owner of the company. Shares are bought and sold on stock exchanges, and their value can fluctuate based on the company's performance.

Reserves are assets that a company holds in reserve to cover unexpected expenses or to meet future obligations. Reserves are not considered part of a company's equity, and they are not paid out to shareholders.

Equity is the difference between a company's assets and its liabilities. It represents the ownership interest of the company's shareholders. Equity can be increased by issuing new shares, by retaining earnings, or by selling assets.

In conclusion, a debenture is a bond, not a share, reserve, or equity.