I WILL GIVE AWAY POINTS IF I GET THE CORRECT OR BEST ANSWER Which sentence uses a verb that agrees with its subject?

A.
People in the city ride the bus.

B.
A box of old photographs were found in the attic.

C.
Our new dog from the shelter were sneaky.

D.
A quartet of young musicians have won several awards.
            please help me you guys!!!(in a nice way)€