Topic: Interchange of Parts of Speech,

Best Answer Explained in Below-:

The correct answer to the question about the verb form of the word "fresh" is A) freshen. This is because "freshen" is a derivative of the adjective "fresh," and it is widely recognized as the verb form meaning to make something fresh or revitalized.

In English, many adjectives can be transformed into verbs by adding specific suffixes. The suffix "-en" is one such common morphological change that signifies the action of imparting the quality described by the adjective. For example, "bright" becomes "brighten," and "sweet" becomes "sweeten." Similarly, "fresh" becomes "freshen," indicating the process of refreshing or renewing.

The other options do not represent accepted or standard verb forms in the English language. "Enfresh," "freshy," and "defresh" are not recognized verbs and do not convey a clear meaning related to the sense of "to make fresh." Therefore, "freshen" is the only answer that accurately captures the intended transformation from an adjective to a verb in a conventional and meaningful way.