Which function is verbal?

A. To act as a verb

B. It has no function

C. To act as another part of speech

D. To act the way we talk

The answer is C~

Verbals are basically verbs that were turned into other parts of speech. Examples are "He loved to learn." Learn was a verb, but now in this sentence loved is the verb instead. Therefore the purpose of verbals is C) to act as another part of speech--because this is their sole function.