Accepting the proposed constitutional amendment would be a poor decision for the Supreme Court to take,
on the basis of avoidance of expanded executive power alone.
(A) on the basis of avoidance of expanded executive power alone
(B) on the grounds of avoiding expanded executive power alone
(C) solely in that, the expansion of executive power should be avoided
(D) if only because the expansion of executive power should be avoided
(E) while the expansion of executive power should be avoided
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Meaning is important to solve the question. There is not much difference between '' on the basis of'' and ''on the ground of''. The first means some criteria or feature on which an action depends, whereas '' on the grounds of '' means only the grounds or specific reasons.
Let's take a look at answer choices.
A - the answer choice has no grammatical error, but if we pay attention to the meaning, it states '' accepting sth would be a poor decision .., on the basis of ...'' - Lets keep it for now and compare it with other answer choices.
B - it doesnt have grammatical issues which jump out - Lets keep it too.
C - use of comma after ''that'' is uncommon and not preferred in gmat. Besides , '' should be avoided'' alters the intended meaning. C is out.
D - ''If only because'' meaning of the sentence is distorted. Moreover, one side of conditional '' if '' is present simple, the other side has '' would'' . D is out.
E - ''while'' may imply that 2 actions are taking place at the same time. It alters the intended meaning and use of '' should be'' may not be acceptable in this case.
Between A and B. B gives us more precise meaning than A does. ''Grounds of '' is preferred in this context than ''on the basis''
Winner is B.
Hope it helps.