If you accept either C or D as the correct revision then you have to accept both of them. Hence the best way to treat the sentence is to ignore both of them.
B is not correct either. You can over punctuate.
That leaves A.
Sometimes the right answer to many things is to do nothing. My dad used to say "Don't fix what isn't broke."
A is the answer <<<<<
TRUE it is true I am pretty sure so TRUE
I believe the answer is "It does not state a life lesson, whereas a theme does"
The answer you are looking for is B.)
Answer:
He is Gatsby's friend. He helped Gatsby to make his money by bootlegging illegal liquor. He is also a gambler. He is important with organized crime.