Answer:
A. Claim B, because it provides evidence that schools have to cover more subjects.
Step-by-step explanation:
The evidence supports Claim B more than it does Claim A because logically since there are more subjects added to the graduation requirements, you would need more hours in the school day to go finish these subjects in addition to the pre-existing ones required to graduate. Although you may disagree, the claim is better supported. The other options don't really make much sense, nor give defensible reasons.