Answer
Choice C
Work Step by Step
Using $x^{m/n}=\sqrt[n]{x^m}=\left(\sqrt[n]{x} \right)^m,$ then
\begin{array}{l}\require{cancel}
x^{5/2}
\\\\=
\sqrt[2]{x^5}
\\\\=
\sqrt[]{x^5}
.\end{array}
Hence, $\text{
Choice C
.}$
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