Perform the Multiplication $- 6 a \left( - 2 a ^ { 2 } \right)$

Multiple Choice

Perform the multiplication: $- 6 a \left( - 2 a ^ { 2 } \right)$

A) $12 a ^ { 3 }$
B) $- 8 a ^ { 3 }$
C) $- 8 a ^ { 2 }$
D) $- 12 a ^ { 3 }$