Question

Which verb agrees with its subject?

The singers or their agent __________ arranging their tour.

A.
is

B.
were

C.
are

D.
have been

Answer 1

i think c is the best verb that agrees with its subject

Answer 2

the answer is a.) is because when you have a plural and a singular verb combined using "or" you use the last subject to pick the verb. So it would be "their agent 'is' arranging".