The best dancer will be given an award at the party is the sentences correctly uses the comparative form of an adverb. Hence, option C is correct.
Adverb is helps to modify the sentence or verb, most of the adverbs ends on ly. like “arrived early,” “runs slowly,” “stayed home,” and “works hard” the words “early,” “slowly,” “home,” and “hard” are adverbs.
Thus, option C is correct.
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