Question

Which sentence uses a verb that agrees with its subject?

A.
A monkey swing from vines in the jungle.

B.
My dog barks at pets near the yard.

C.
The bear dig for clams in the sand.

Answer 1

The answer is B because the subject is singular and the verb is plural 
and A and C has both their verbs and subjects singular

Answer 2

I think that the answer is A.