Choose the Expression That Is Equivalent to the Following $1 \left( 6 x ^ { 3 } \right)$

Choose the expression that is equivalent to the following: $1 \left( 6 x ^ { 3 } \right)$

A) $6 x ^ { 3 }$
B) $7 x ^ { 3 }$
C) 1
D) $6 x ^ { 4 }$