Answer
$x = \frac{3}{5}$, so (A)
Work Step by Step
A general rule for converting roots to exponents is: $\sqrt[c]{ b^a} = b^{\frac{a}{c}}$
In this case, 3 is the power inside the root, so a = 3, and 5 is the power of the root itself outside the root, so b = 5
$x = \frac{a}{b} = \frac{3}{5}$
