That is correct! In sentence A, the adverb "extremely" modifies the adjective "tight," providing additional information about the degree or intensity of the tightness. To identify sentences where an adverb modifies an adjective, you need to look for words that describe or provide more detail about the adjective in the sentence. In this case, "extremely" describes the adjective "tight" and indicates the extent or intensity of the tightness. Well done!