Answer;
D. One of Jupiter's moons has a lot of volcanic activity
Explanation;
Verb must agree with the amount in the subject
; for instance;. I-am, they-are, the ball has, the balls have, Jack and Jill were, Jack was
-if each/every precedes subject, the verb is always singular
-if there are two subjects with different amounts, the verb takes the amount of the closest subject
-a collective noun that refers to a group, the verb is always singular
