og12 语法第33题，求高人解答，真心求教

miweekend

33.    Because an oversupply of computer chips has sent
prices plunging, the manufacturer has announced that
it will cut production by closing its factories for two
days a month.

(A)    Because an oversupply of computer chips has
sent prices plunging,
(B)    Because of plunging prices for computer chips,
which is due to an oversupply,
(C)    Because computer chip prices have been sent
plunging, which resulted from an oversupply,
(D)    Due to plunging computer chip prices from an
oversupply,
(E)    Due to an oversupply, with the result that
computer chip prices have been sent plunging

对og解释不理解，选项A中 an oversupply后面的谓语怎么可以说是has sent prices plunging，供应过剩怎么可以价格下降，搞不懂。
C还有就是对C的解释，不理解啊。
求高手赐教。