Multiply and Leave Your Answer in Exponent Form $\left( 5 ^ { 9 } \right) \left( 5 ^ { 8 } \right)$

Multiply and leave your answer in exponent form.
- $\left( 5 ^ { 9 } \right) \left( 5 ^ { 8 } \right)$

A) 5⁷²
B) 25⁷²
C) 25¹⁷
D) 5¹⁷