If additional deposits of oil are found, it will expand the amount that can be used as fuel and reduce the price of oil, even if the deposits are not immediately tapped.
(A) it will expand the amount that can be used as fuel and reduce the price of oil
(B) the amount that is able to be used as fuel will expand and the price of oil be reduced
(C) it will cause an increase in the amount that is able to be used as fuel and a reduction in the price of oil
(D) the amount that can be used as fuel will increase and the price of oil will drop
(E) it will increase the amount of oil that can be used as fuel and cause a drop in the price

答案是D，我的疑问是 that can be used as fuel 修饰的是amount，而amount 怎么能当成燃料呢。

the amount (of oil) that can be used as fuel will increase

that定从修饰oil, the amount will increase.

thanks a lt !!!!!!!