Respuesta :
The correct answer is…drumroll please…”b. has.” Here’s why:
We can eliminate “c” and “d” immediately because they don’t make sense grammatically. Then, to determine whether the appropriate verb is have or has, we need to make sure that the verb “agrees” with the subject in number. This task is relatively easy when the subject is a single word: The house is on fire. When we’re confronted with an “either/or” or “neither/nor” construction, we need to go with the noun that is closer to the verb (in this case, “sister”). That’s because we’re only referring to one or the other, the sister or the brother, but not both. If, on the other hand, you had written, “My brother and my sister,” the verb would be have visited.
