How does the drug Procardia XL (nifedipine) work in lowering blood pressure?
A. Slow the rate at which calcium passes into the heart muscle thereby relaxing the vessels
B. Block the effect of the sympathetic nervous system that responds to stress by increasing blood pressure
C. Dilate the arterioles by preventing the formation of Angiotensin II
D. Dilate the arterioles by directly blocking the action of Angiotensin II
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