Compute $f ^ { \prime } ( a )$ For $a = 1$

Multiple Choice

Compute $f ^ { \prime } ( a )$ for $a = 1$ .
$f ( x ) = 2 - 6 x ^ { 3 }$

A) $12$
B) $- 18 x ^ { 2 }$
C) $- 18$
D) $18$
E) $36$