If $x$ and $y$ are both positive then $\sqrt{72x^3y^{16}}=$

If $x$ and $y$ are both positive then $\sqrt{72x^3y^{16}}=$

A. $8xy^8\sqrt{2x}$

B. $6xy^4\sqrt{2x}$

C. $6xy^8\sqrt{2x}$

D. $6y^4\sqrt{8x}$

E. $9xy^8\sqrt{8x}$

Answer: C

Source: Magoosh

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