Which words in the sentence are the adjective clause? Alessandra's skill, which is highly regarded, is second only to her grace on the tennis court.

A. to her grace on the tennis court

B. on the tennis court

C. which is highly regarded

D. Alesandra's skill is second only

Among the choices stated above, the adjective clause in the sentence is:

C. which is highly regarded

Adjective clause begins with a pronoun such as that or which and an adverb such as those which answers the questions why, where, or when. As the name suggests, this clause functions as an adjective.