Use Rational Exponents to Simplify $\sqrt [ 20 ] { ( 10 y ) ^ { 4 } }$

Multiple Choice

Use rational exponents to simplify. Assume that all variables represent positive real numbers.
- $\sqrt [ 20 ] { ( 10 y ) ^ { 4 } }$

A) $\sqrt [ 5 ] { 10 y }$
B) $\sqrt [ 16 ] { 10 y }$
C) $\sqrt [ 5 ] { 10 \mathrm { y } ^ { 4 } }$
D) $100,000 y ^ { 5 }$