A sentence reads: "Aishwarya is a great dancer, but she acts ordinarily." The main issue is that it lacks parallelism between 
Atwo noun forms describing comparable activities
Btwo prepositional phrases modifying the same noun
Can adjective and an adverb in the same clause
Dtwo clauses with different tenses
Answer & Solution
Correct answer: A. two noun forms describing comparable activities
The sentence contrasts two activities, but it uses "dancer" (a noun) in one part and "acts" (a verb) in the other. A better version would keep the forms parallel, such as "Aishwarya is a great dancer, but an ordinary actor" or "Aishwarya dances greatly, but acts ordinarily."
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