783. The most favorable locations for the growth of glaciers, rather than being the cold, dry polar regions, would be instead the cool, moist middle latitudes, where there is abundant precipitation and where it is cold enough to allow some snow to accumulate year by year.

(A) glaciers, rather than being the cold, dry polar regions, would be instead the cool, moist middle latitudes
(B) glaciers are not the cold, dry polar regions but the cool, moist middle latitudes
(C) glaciers are the cool, moist middle latitudes rather than the cold, dry polar regions
(D) glaciers, instead of being the cold, dry polar regions, would be the cool, moist middle latitudes
(E) glaciers are, instead of the cold, dry polar regions, rather the cool, moist middle latitudes

Solution:

Idioms + Modifiers

In B “...not X ...but Y…” is idiomatic and hence, B is the best choice.

In A, D, and E, use of “being” makes the sentence wordy and awkward.
Furthermore in E, use of “instead of” along with “rather than” leads to redundancy.
In C, "where there is abundant precipitation...." must be placed close to "the cool, moist middle latitudes". Hence, it is a modifiers error.

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