The major areas of medicine in which lasers are effective is in the cutting and closing of blond vessels, and in the destruction of tumors.
(A) is in the cutting and closing of blood vessels, and in the destruction
(B) are the cutting and closing of blood vessels, and also the case of destroying
(C) are the cutting, closing of blood vessels, and in the destroying
(D) are the cutting and closing of blood vessels, and the destruction
(E)is in the cutting and closing of blood vessels, and the destroying

ans is D

but aren't cutting and closing parallel with destroying..... pls suggest...