gorupruthi wrote:
Why B is incorrect.
Yet in C is making contrast that is not required.
As the housing affordability gap widens, middle-income families are especially hard-hit, since these families can no longer afford to buy homes, furthermore 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.
*since these families can no longer afford to buy homes: In GMAT SC, since is not used to describe causation; since should be followed by time/date
*As the housing affordability gap widens, middle-income families are especially hard-hit, since these families can no longer afford to buy homes
This is an entire clause. The next independent clause that follows after comma starts with furthermore, which is not a coordinating conjunction. Making the entire sentence a run-on.As the housing affordability gap widens, middle-income families are especially hard-hit, for these families can no longer afford to buy homes, yet 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.
As the housing affordability gap widens, middle-income families are especially hard-hit-Independent clause
, for these families can no longer afford to buy homes-Independent clause properly connected with coordinating conjunction "for". "for" here is used as because.
,yet rising rental rates force them to use far more than the standard 25 percent of their incomes for housing-Again two Independent clauses connected by coordinating conjunction
Also, "contrast" is very much needed.
Firstly, those middle class can't afford to buy homes due to the rising rate of the houses.
And to make matter worse(Yet), they have to pay >25% of the income in rent, this entire sequence of events is resulting in: "leaving(present participle is required to convey the effects of events previously described) them with no equity or tax write-offs to offset the expenditures."