Answer
C. $\frac{25a^{12}}{b^{6}}$
Work Step by Step
$(\frac{5a^{6}}{b^{3}})^{2}=\frac{5^{2}(a^{6})^{2}}{(b^{3})^{2}}=\frac{25a^{6\times2}}{b^{3\times2}}=\frac{25a^{12}}{b^{6}}$
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