It's obviously not going to be A because paragraph 2 has nothing to do with the coach. It won't be C because the second paragraph don't talk about any sort of gymnastics or tumbling. And lastly, it won't be D because swimming would be to ramdom to fit with the flow of the text. Looks like you're left with
It's A. He has a heart of gold because it compares without using like or as
Hi !!
To swim
swim (present) // swam (past) // swum (past participle)
hope I helped !!
