Use the Product Rule to Simplify the Expression $\left( 8 p ^ { 9 } \right) \left( - 7 p ^ { 8 } \right)$

Multiple Choice

Use the product rule to simplify the expression. Write the result using exponents.
- $\left( 8 p ^ { 9 } \right) \left( - 7 p ^ { 8 } \right)$

A) $56 \mathrm { p } ^ { 72 }$
B) $56 p ^ { 17 }$
C) $- 56 p ^ { 72 }$
D) $- 56 p ^ { 17 }$