The approach is probably slightly different for each type of question, but it's important to remember that there is only one correct answer. If you were to challenge an answer choice with GMAC, they'd be able to point to a specific word or phase that makes the answer choice wrong.
Rather than ranking questions in order of which is best, you might try crossing out answers if they have anything wrong with them.
(This list is more specific to CR questions, but the same concept can apply to most RC questions)
A) X - Too extreme
B) X - Irrelevant
C) X - Out of Scope
D) X - Opposite
E) * - Correct
Also: Your search for the correct answer will be much shorter if you try to pre-phrase the answer before reading the answer choices. This will also save you from trap answers that sound good, but send you down the wrong path.
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