Compute the Derivative Function $f ^ { \prime } ( x )$

Multiple Choice

Compute the derivative function $f ^ { \prime } ( x )$ algebraically.
$f ( x ) = 8 - 5 x ^ { 3 }$

A) $f ^ { \prime } ( x ) = 15 x ^ { 2 }$
B) $f ^ { \prime } ( x ) = - 15 x$
C) $f ^ { \prime } ( x ) = - 15 x ^ { 2 }$
D) $f ^ { \prime } ( x ) = 8 - 15 x ^ { 2 }$
E) $f ^ { \prime } ( x ) = 10 x ^ { 2 }$