Simplify Assume That All Variables Represent Positive Real Numbers $\sqrt { 50 x ^ { 2 } y }$

Multiple Choice

Simplify. Assume that all variables represent positive real numbers.
- $\sqrt { 50 x ^ { 2 } y }$

A) $5 x \sqrt { 2 y }$
B) $5 x y ^ { 2 } \sqrt { 2 }$
C) $5 x ^ { 2 } \sqrt { 2 y }$
D) $5 x y \sqrt { 2 }$