On the GRE Quantitative Reasoning section, what is the most efficient approach to Quantitative Comparison questions where both quantities contain variables?
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A
Always substitute x=1 to compare the quantities
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B
Substitute multiple values including negatives, fractions, and zero to test edge cases
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C
Solve algebraically and assume the relationship holds for all values
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D
Choose 'The relationship cannot be determined' as a default safe answer