why are capillaries and not arteries or viens not found in alveoli,nephrones,and villi

A.vessels must be small so that very little blood enters these tissues
B.vessle must be narrow so that very smal moluculescan reach these tissues
C.vessls must be light wieght so that way they dont interfere with the movement of these tissues
D. vessels walls must be thin to allow ease transfer of molucules to these tissues

I believe it's D but you should get a second opinion just to be sure.:)

The answer is D

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