Find the Sum or Difference $$\left( 3 m ^ { 4 } \right) \left( 2 m ^ { 4 } \right)$$

Multiple Choice

Find the sum or difference.
- $$\left( 3 m ^ { 4 } \right) \left( 2 m ^ { 4 } \right)$$

A) $6 \mathrm {~m} ^ { 8 }$
B) $- 6 m$
C) $6 \mathrm {~m}$
D) $- 6 m ^ { 8 }$