The audience couldn't stop applauding as the dancers performed phenomenal.
Show answer & explanation
Correct answer: A
Explanation
The original sentence ends with "the dancers performed phenomenal." In English grammar, "performed" is a verb, and words that describe how an action is performed must be adverbs.
"Phenomenal" is an adjective, which is used to describe nouns (e.g., "a phenomenal performance").
We must use the adverbial form, "phenomenally," to correctly modify the verb "performed."
Correct sentence should be:
The audience couldn't stop applauding as the dancers performed phenomenally.