Gauravvinod92
why "rather than as" instead of "rather than" in the option A.
You ask a simple yet complicated question,
Gauravvinod92. The short answer is that GMAC™ likes to preserve a parallel construct whenever possible, and
as A, rather than as B is perfectly parallel. Furthermore, GMAC™ tends to be more conservative in its adherence to grammatical conventions, an example being something like the
that that is often omitted in regular speech. (Such an omission is called an
ellipsis, and you can read more about that in
this article from the Cambridge Dictionary.) A good rule of thumb is that when in doubt, opt for a more conservative construct than a progressive one. This is one of the reasons you cannot let your ear guide you in SC. The way people speak everyday and the way a traditional grammar would express a similar notion are often different, and the GMAT™ is constructed more with the latter in mind.
For those arguing that the omission of
as is fundamentally incorrect, that is itself an incorrect contention. Rather, the difference between the two clauses below draws attention to a second grammatical condition, this one called
syntactic pleonasm, which occurs when a function word (such as
that from the above example) is
optional, in terms of expressing the vital meaning of the sentence, but is preserved anyway.
1) cattle were traditionally used as beasts of burden, rather than
as a food source (
formal: syntactic pleonasm)
2) cattle were traditionally used as beasts of burden, rather than [as] a food source (
informal: ellipsis)
Notice that for 2) to work, the placement of the comparative phrase is crucial, or else the meaning of the sentence is changed entirely:
3) cattle, rather than a food source, were traditionally used as beasts of burden (incorrect, since a food source cannot be used as a beast of burden)
It is for the sake of clarity that the more formal version is preferred, nothing more. Choices (C) through (E) contain other errors that allow us to eliminate them definitively:
being, a mismatched as/for comparison, and an incorrect idiom in
used for, respectively.
I hope that helps shed some light on the issue. If you have further questions, feel free to ask.
- Andrew