Write the Following Expressions So That No Answer Includes Negative $( 5 x ) \left( 4 x ^ { 2 } \right) ^ { 2 }$

Multiple Choice

Write the following expressions so that no answer includes negative exponents.Assume the variables are nonzero.
- $( 5 x ) \left( 4 x ^ { 2 } \right) ^ { 2 }$

A) $40 x ^ { 5 }$
B) $20 x ^ { 5 }$
C) $160 x ^ { 6 }$
D) $80 x ^ { 5 }$
E) None of these