Which is the most effective piece of evidence to support the claim that adolescents who exercise daily are healthier than those who are inactive?

The claim compares the health of adolescents who exercise daily with those who are inactive. The strongest evidence directly describes health benefits among daily exercisers: stronger muscles, better respiratory fitness, and lower body fat. Choice A discusses possible harms of inactivity, but D more directly supports the claim by identifying several measurable health advantages of exercising.

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