Behave (as a gentleman behaves). The bracket part is -

Behave (as a gentleman behaves). The bracket part is - Correct Answer an adjective clause

যে সব clause, adverb এর মতো verb কে modify করে তা adverb clause. As a gentle man behaves " verb কে modify করেছে। সুতরাং সঠিক উত্তর an adverb clause.

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Behave how a gentleman behaves. Here the underlined part(how a gentleman behaves) is a/an-