Topic: Right Form of Verb,

Best Answer Explained in Below-:

The phrase "It is no use — about it" indicates that there is a futility or ineffectuality regarding a certain action. In English, the expression "It is no use" is typically followed by a gerund (the -ing form of a verb), which denotes ongoing action or a general act.

Among the options provided:

A) "worrying" (gerund form) fits grammatically and contextually, as it suggests that worrying about something is pointless.

B) "to worry" (infinitive form) is grammatically incorrect after "It is no use," as this structure does not typically accommodate the infinitive.

C) "worry" (base form) also does not work in this context because it lacks the necessary gerund structure.

D) "for worry" is incorrect because it misuses the preposition "for" and does not convey the intended meaning.

Thus, "worrying" is the appropriate choice, capturing the intended sentiment of futility in worrying about a situation, as it conveys the sense of an ongoing action that is deemed ineffectual. Hence, the correct answer is A) "worrying."