The question asks to complete a sentence about financial securities. A financial security that represents an ownership interest* in a corporation is known as corporate stock. A bond, on the other hand, represents a debt. Corporate stock, representing ownership, is considered an equity security. A debt security represents a loan. Therefore, the completed sentence should be: "The type of financial security that represents an ownership interest in a corporation is known as corporate stock. This type of security is considered to be an equity security." Let's check the options: a bond / an equity (Incorrect, bond is not ownership) a bond / a debt (Incorrect, bond is debt, but not ownership) corporate stock / an equity (Correct, corporate stock is ownership and is an equity security) corporate stock / a debt (Incorrect, corporate stock is not a debt security) The final answer is $\boxed{\text{corporate stock / an equity}}$