[求助] 关于蓝皮书P242第8题的疑问

8. Lacking information about energy use, people tend to overestimate the amount of energy used by equipment. such as lights, that are visible and must be turned on and off and underestimate that used by unobtrusive equipment, such as water heaters.

(A)  equipment, such as lights, that are visible and must be turned on and off and underestimate that

(B)   equipment, such as lights, that are visible and
    must be turned on and off and underestimate it when

(C)  equipment, such as lights, that is visible and must be turned on and off and underestimate it when

(D)  visible equipment, such as lights, that must be
    turned on and off and underestimate that

(E)   visible equipment, such as lights, that must be
    turned on and off and underestimate it when

哪位牛牛帮忙解答下C与D的区别呀

  that 是不是既作underestimate的宾语 又作used的宾语呀？

看了资料 回想起来了 还是自己解决吧

考了平行结构 “and” 出现 所以  overestimate the amount of energy used 与你underestimate that  平行 that 代词指代 amount of energy