HELP ASAP PLEASE Which sentence is true about including captions in visual aids?

A.
They convey the purpose of the visual.
B.
They provide additional information about the visual.
C.
They include a list of references about the visual.
D.
They cite the source of the visual.
E.
They define any symbols or special characters in the visual.

C.they are verbs.

Syllable added to a root word to change its meaning : affixan independent word--example run,walk,book : free morphemeaffix that gives grammatical meaning such as tense or number : inflectiona word part that must attach to a word in order to be usable : bound morphemedegree of comparison formed by adding -er or more to an adjective : comparativedegree of comparison formed by adding -est or most to an adjective : superlativeaffix added to the beginning of a word : prefixaffix added to the end of a word : suffixroot word of lovable : lovetwo roots used together to form one word : combining form