Which sentence uses a verb that agrees with its subject?
a.
a horse eat oats.
b.
cows graze on hay in the field.
c.
we seen a brown cow.
d.
squirrels digs through dirt and grass.

It's B as both the subject and the verb are in the plural. C) is not correct as the answer uses an incomplete present perfect, and A) has the subject in the singular while the verb does not match due to the missing '-s' in third person singular.

Not really sure but wow ur work is hard