Use the Product Rule to Simplify the Expression $( - 4 x ) \left( - 5 x ^ { 2 } \right) \left( x ^ { 4 } \right)$

Multiple Choice

Use the product rule to simplify the expression.
- $( - 4 x ) \left( - 5 x ^ { 2 } \right) \left( x ^ { 4 } \right)$

A) $9 x ^ { 6 }$
B) $20 x ^ { 7 }$
C) $10 x ^ { 7 }$
D) $20 x ^ { 6 }$