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Please explain to me what the correct answer is and why.

Conclusion: moderate exercise lowers the risk of arterial blockage due to blood clots

P1: lowers blood cholesterol → lowers the risk of hardening arteries → lowers the risk of arterial blockage due to blood clots
P2: data are correct → moderate exercise lowers blood cholesterol

If the sufficient condition of P2 is assumed, we can plug moderate exercise into the front end of the P1 chain:
moderate exercise → lowers blood cholesterol → lowers the risk of hardening arteries → lowers the risk of arterial blockage due to blood clots

Thus, choice D is correct.

Thank you Cambridge. I'm an idiot. I had all the relationships worked out but I failed to realize that the first sentence, not the last, was the conclusion. Go me.