Topic: Subject Verb Agreement,

Best Answer Explained in Below-:

The sentence "You are the man who....... always trouble me." requires a verb that agrees with the subject "you" in terms of tense and number. In this context, "who" refers to "the man," which is a singular noun. Thus, the correct verb form should either indicate a continuing action or a current state.

Among the options given:

A) "is" - This is the present tense form of the verb "to be," and when combined with "who," it sets the stage for a defining characteristic or current situation. It implies that the individual in question is indeed the person causing trouble now.

B) "have" - This is incorrect because it requires a plural subject ("you have") but fails to align with the singular noun "man" that is being modified by "who."

C) "has" - This option is inappropriate because "has" is used with singular third-person subjects (he, she, it), not "you."

D) "were" - This is a past tense verb that would suggest an action that happened before, which doesn't align with the immediate context of "always trouble me."

Thus, "is" correctly conveys a present and ongoing scenario, making option A the appropriate choice.