语法大全sectionD-2

2.     As the housing affordability gap widens, middle-income families are especially hard-hit, and these families can no longer qualify to buy homes, and rising rental rates force them to use far more than the standard 25 percent of their incomes for housing, leaving them with no equity or tax write-offs to offset the expenditures.

(A) and these families can no longer qualify to buy homes, and

(B) since these families can no longer afford to buy homes, furthermore

(C) for these families can no longer afford to buy homes, yet

(D) and these families can no longer afford to buy homes; however,

(E) and these families can no longer afford to buy homes, for

答案是C，请问为什么，我觉得好像都可以。谢谢。

逗号加for表原因

我觉得其他几个并列的也没错阿。