D.) All students should be required to participate in a team sport
A and C are definitely incorrect because they have nothing to do with the topic at hand.
B sounds like it may be correct, but the word "participants" implies that there is a choice to join team sports...so why would it matter if students enjoy or are skillful at team sports if they can simply opt to not partake in them?
D is definitely correct because it directly correlates with the given counter and it directly states that students should have no choice when it comes to choosing whether or not to partake in team sports. The counterclaim given is therefore the perfect combat to this claim.