Question

1. which sentence contains a subject - verb agreement error? the pack of wolves is howling at the moon. either the cat or the dogs needs a new collar. my glasses are on the nightstand. everyone in the room was silent during the movie.

Explanation:

In the sentence "Either the cat or the dogs needs a new collar.", when using "either...or", the verb should agree with the noun closest to it. Here, "dogs" is plural, so the verb should be "need" instead of "needs". The other sentences follow subject - verb agreement rules correctly.

Answer:

B. Either the cat or the dogs needs a new collar.