C is grammatically correct
Answer:
it's D: make no change
Explanation:
A. is not correct because singular verbs used are used with third person singular subhects such as he,she, and it.
B. is incorrect because if you put it in the sentence and read it, it doesn't sound right.
C. is incorrect because you only used a plural verb if the subject is plural
THEREFORE D IS THE CORRECT ANSWER.
