Topic: Interjection,

Best Answer Explained in Below-:

In the sentence "It was wise enough to accept the offer," the word "enough" is functioning as an adverb, specifically an adverb of degree. Adverbs of degree modify adjectives (or other adverbs) to specify the intensity or extent of the quality being described.

In this case, "wise" is an adjective that describes the subject "it." The phrase "wise enough" indicates that the level of wisdom is sufficient to justify the action of accepting the offer. The word "enough" enhances the adjective "wise" by providing more information about the degree of wisdom—suggesting that the wisdom exhibited is adequate for the decision being made.

To distinguish "enough" from other parts of speech: as a preposition, it wouldn’t fit in this context, and while it can appear in noun phrases (like “enough of this”), in this sentence, it's specifically modifying the adjective. If it were a conjunction, it would connect clauses, which is not the case here. Thus, in this context, "enough" clearly performs the role of an adverb.