Identify the segment that contains a grammatical error. If there is no error, select 'No error'.
He behaves so aggressive in his new home that he is rehoused with an old/ couple who could give him everything he lacks.

Correct option is A

Option (a) contains an error.
Explanation: The word “aggressive” is an adjective. After “so”, we need an adverb to modify the verb “behaves.” The correct usage is “so aggressively.”
Correct sentence: He behaves so aggressively in his new home...
Grammatical rule used:
Adverbs are used to describe or modify verbs, adjectives, or other adverbs. Since “behaves” is a verb, the modifying word must be an adverb.
Example: He speaks politely. (Not “polite”)
Information Booster:
Commonly confused pairs include – loud/loudly, quick/quickly, bad/badly – always match part of speech with function.