The correct answer is C. Capable of being imagined
Step-by-step explanation:
A suffix refers to a syllable or set of letters at the end of a word that modifies the meaning of it. In the case of the word "imaginable" this word includes the root word "imagine-" that derives from "image" (visual representation) and the suffix "able" that means "capable of" or "fit for". This implies the word "imaginable" refers to elements that are capable of being visually represented or imagined. For example, in "Susan tried every imaginable food during the trip" the word "imaginable" explains Susan eat all kinds of food or every food one is capable of imaging. Thus, from the options, the best definition of "imaginable" is capable of being imagined.