Answer:
D. The staff get pizza and then eat together in the break room.
Step-by-step explanation:
Subject-verb agreement deals with a singular subject having a singular verb and a plural subject having a plural verb.
In the answer: The staff get pizza and then eat together in the break room.
The staff all get pizza together which makes them able to eat it together in the break room.
The Staff is plural and it should be followed by a plural verb which is ‘eat’ . This makes it correct
Note: eats, drinks etc are singular verbs.