请教og165

165. At Shiprock, New Mexico, a perennially powerful girls' high school basketball team has become a path to college for some and a source of pride for a community where the household incomes of 49 percent of them are below the poverty level.

(A)  where the household incomes of 49 percent of them are

(B)   where they have 49 percent of the household incomes

(C)  where 49 percent of the household incomes are

(D)  which has 49 percent of the household incomes

(E)   in which 49 percent of them have household incomes

请问各位大牛，这道题为什么选c,我认为49%应该指人，社区的人。所以我选 e,请翻译一下，并解释解体思路，谢谢