What makes the following sentence unclear?

I had hoped to finish the race and win a medal, but I didn’t.
Select one:
a. Nothing. The sentence contains no errors.
b. There are two possible meanings to the last part of the sentence.
c. It is an incomplete sentence and therefore a fragment.
d. It’s a simple sentence and doesn’t need a comma.

okay well 1st, let's cross out "a" because there is a error and they wouldn't ask that question unless there was a error.

2nd, "d" does need a comma because you are connecting 2 independent clauses(I had to search that up) but what I'm trying to say is there's a "and" in between the 2 things you are connecting.

Explanation:

Now, "b" is really close and make sense BUT "c" is true since a fragment is not a complete sentence like it can be like a short phrase. When you read it, it doesn't sound right. Brainliest plss

entrepreneur give a lot of money to people so the answer is a