devashish wrote:
Declining revenues resulting from a decrease in business travel, a source of income without which most commercial airlines could not survive, are going to force many commercial airlines to increase prices and decrease services in the coming months
(A) a source of income without which most commercial airlines could not survive, are
(B) a source of income without which most commercial airlines could not survive, is
(C) and most commercial airlines use it as a source of income to survive with, are
(D) which is a source of income which is needed by most commercial airlines who could not survive without it, are
(E) which most commercial airlines use as a source of income without which they are unable to survive, is
KAPLAN OFFICIAL EXPLANATION:
No, this isn't the most eloquent sentence that one could write, but it is grammatically correct and uses modifiers correctly. In the original sentence, the clause beginning a source modifies business travel, and follows it immediately, as any well placed modifier should.
Answer choices (C) and (D) create an error by altering that clause so that it no longer acts as a modifier, though it must for the same reasons that Scribner's needed its modifier above. The remaining choices differ with respect to the final verb: is is or are correct? Since the subject of the sentence is declining revenues, itself plural, then the verb should be are. Eliminate (B) and (E). Only (A) remains.
Just want to know that is the user of "which" in option C and D is wrong or Not. And which one is preferable which or a source? If we put aside other error is the usage of which in " c and d " is correct?