Pretty confident that it is A, judging by that the word composition is used as a combination or a ratio of 2 things. Also none of the other options make sense.
John could reply with "Its not my fault. I just followed the orders and if I made you look like a fool, wouldnt it also be everyone elses fault too?"
Explanation:
I guess Muscle strength and endurance then there is Cardiovascular Endurance that can help. Flexibility not so much. Body composition helps very much.
Answer:
My final answer would be Body Composition. Nothing else matters that much. In order to swim you need to use to use your body.
