Correct Answer: Option B
underlined বাক্যটি "not to hurt anybody's feelings" হল একটি infinitive phrase, যা এখানে কাজ করে একটি adverbial phrase হিসেবে.
An infinitive phrase is a phrase that begins with an infinitive (to + verb) and functions as a noun, adjective, or adverb in a sentence. In this case, the infinitive phrase "not to hurt anybody's feelings" functions as an adverbial phrase because it modifies the verb "remained cautious." It tells us the reason why the speaker was cautious while sharing her views.
Option A, "prepositional phrase," is incorrect because the phrase does not begin with a preposition.
Option C, "participle phrase," is incorrect because the phrase does not contain a participle.
Option D, "noun phrase," is incorrect because the phrase does not function as a noun.
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