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Per ETS's Mathematical Conventions for GRE Quant, two assumptions baked into every question are
Aall numbers are integers; figures are drawn to scale
Bcomplex numbers may appear without notice; angles are in radians
Cthe calculator is always disabled; the answer is always positive
Dall numbers are real; figures are not necessarily drawn to scale
Answer & Solution
Correct answer: D. all numbers are real; figures are not necessarily drawn to scale
ETS conventions, verbatim: '(1) all numbers used are real numbers and (2) geometric figures are not necessarily drawn to scale.' These two assumptions hold across every Quant question unless overridden in the prompt. Integers-only would exclude fractions; calculator-disabled is wrong; complex numbers don't appear; angles are in degrees.
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