Topic: Interchange of Parts of Speech,

Best Answer Explained in Below-:

The question asks for the verb form of "fool." Among the provided options, the most appropriate choice is "D) Befool."

To understand why "befool" is the correct answer, we must first look at the nature of the words listed. "Fool," as a noun, refers to a person who lacks good sense or judgment. However, it can also be employed as a verb, meaning to deceive or trick someone. The verb "befool" specifically means to make a fool of someone or to deceive them, thus reflecting the action of fooling more directly.

The other options do not serve as verb forms:
- A) "Foolish" is an adjective describing someone lacking sense.
- B) "Foolishness" is a noun denoting the quality of being foolish.
- C) "Fooled" is the past tense of the verb "fool," but it functions as a past participle rather than the base form.

In summary, "befool" captures the essence of the action of deceiving someone, aligning closely with the root meaning of "fool" as a verb. Hence, "befool" is indeed the correct answer.