Simplify the Expression $( 10 x y ) ^ { 2 }$

Multiple Choice

Simplify the expression. Assume all variables represent nonzero real numbers.
- $( 10 x y ) ^ { 2 }$

A) $100 x ^ { 2 } y ^ { 2 }$
B) $100 x y$
C) $20 x ^ { 2 } y ^ { 2 }$
D) $20 x y$