The correct response that illustrates the difference between the U.S. dollar, a form of fiat money, and a U.S. gold certificate, a representative currency, is:
A U.S. dollar does not represent a claim to some specific asset.
This is because fiat money, like the U.S. dollar, is not backed by any physical commodity and does not represent a claim to a specific asset, while a gold certificate is backed by a specific amount of gold, representing a claim to that asset.