Answer:
B It celebrates the independence of the United States
Explanation:
all other are opinions
The answer is B because it doesn't have any commas and it wouldn't make sense without it. Looks like you got it correct.
She likes to spend time with him because she thinks he understands her.
The right answer is A. because the possession would be Howard's fault and the contraction would be it's.
hope this help you out and good luck