Question

which of the following is an adverb ?

A. Loud
B. Loudly
C. Loudest
D. Louder

Answer 1

I guess loudly

since most of the adverbs end with -ly

Answer 2

B. Loudly is an advert as it describes how the verb is performed. For example: he sang “loudly”. In this phrase, the adverb loudly describes how the man sang.