Which sentence uses a verd that agrees with its subject? PLZ HELP!!!!!

A) the post offices in our area opens at 9 a.m.

B) their behavior during the performances was very good.

C) a new book by Ruth Rendell, the author of many mysteries, arrive in bookstores soon.

D) the dresses on the rack in the back of the department was on sale.

Respuesta :

The correct answer is:  [B]:
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    "Their behavior during the performances was very good."
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{Assuming the question meant to ask:

"Which sentence uses a VERB that agrees with its subject?" } 
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