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Moderate

Exponents: Which is Rational

GMAT-E19DOR

Which power, when evaluated, is a rational number?

A

$\pi ^3$

B

$e^{\cfrac{1}{3}}$

C

$81^{\cfrac{3}{4}}$

D

$(-4)^{\cfrac{1}{2}}$

E

$64^{\cfrac{2}{5}}$