Find the Product $$\left( - 4 m ^ { 3 } \right) \left( 5 m ^ { 2 } \right)$$

Multiple Choice

Find the product.
- $$\left( - 4 m ^ { 3 } \right) \left( 5 m ^ { 2 } \right)$$

A) $- 20 \mathrm {~m} ^ { 5 }$
B) $- 20 \mathrm {~m}$
C) $20 \mathrm {~m} ^ { 6 }$
D) $20 \mathrm {~m}$