The sentence that uses the underlined word correctly is, At last Saturday's meet, he did especially well on the parallel bars. The correct answer is option b. Why "well" and not "good"? The word good is only used as an adjective. An adjective only modifies a noun. The word "well" is an adverb. An adverb modifies an adjective, a verb and an adverb. In the given sentence, it uses the verb "did" therefore, the appropriate word should be well and not good.
