<span>The correct roots are cred, graph, and vis. These are root words, meaning they form the core meaning of a word. The root "cred" means "to believe" (as in "a credible source"), the root "graph" means "to write" (as in "graphing paper"), and the root "vis" means "to see" (as in "visible happiness").
The other options are prefixes, meaning they are attached to the beginning of a root word to clarify or change the meaning of the root. "Anti" means "against," "con" means "with," and "post" means "after." These prefixes cannot stand on their own and must be added to a root in order to mean something. For example, an antiviral drug works against a virus. </span>
