140. 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
Let’s revisit this thread from the meaning point of view. Choice A, C, D and E are all grammatically correct; Only B is a run-on.
The point here is that, since the middle-income group has to shell out a hell of a lot of money on rentals, they don’t have enough for the up-front payment to buy a house. In other words, high rents are the reason of their inability. One can see a thread of causation here and per se, we need to bring in a transitional conjunction such as 'for' or 'because, into the picture to draft the high rentals. ‘And’ in A is a mere same direction affirmative conjunction and is out. ‘Yet’ in C and ‘however’ in D introduce an unwarranted contrast; only E seeks to justify the causation by putting up the required causative conjunction ‘for’.
I cannot see how C could be good enough to merit the OA. It is evident from the serial No 140 that the question is from the not so authentic 1000 series, perhaps the reason for the wrong OA.