Which part of the sentence functions as an adverb?

of the company

overseeing the department

to better augment

existing sales force

C

Explanation:

to better argument

The correct answer is: to better argument.

Explanation:

In this sentence, we use the adverb of purpose (to better argument) to clarify a certain action (in this case, to explain why the administrator of the company added new personnel) by providing to us more information about the action.

In general, we use adverbs to clarify, modify, and explain verbs, clauses or other adverbs.