The correct answer is C, as a dollar bill is an example of representative money.
Representative money is a type of money that, unlike merchandise money, is based on another asset, such as money backed by gold, silver, oil or another currency, which has the quality of being convertible to the asset at which represents, which can be a kind of metallic money. This expression is also used to refer to a physical or electronic certificate that represents the issuer's intention to pay the certificate holder, such as, for example, a check.