Multiply and Leave Your Answer in Exponent Form $( 7 x ) \left( 8 x ^ { 5 } \right) \left( x ^ { 7 } \right)$

Multiple Choice

Multiply and leave your answer in exponent form.
- $( 7 x ) \left( 8 x ^ { 5 } \right) \left( x ^ { 7 } \right)$

A) $56 \mathrm { x } ^ { 12 }$
B) $15 x ^ { 12 }$
C) $56 x ^ { 13 }$
D) $16 \mathrm { x } ^ { 13 }$