Let $f ( x ) = \frac { 1 } { 2 } - 4 x$

Multiple Choice

Let $f ( x ) = \frac { 1 } { 2 } - 4 x$ Then $f ^ { \prime } ( x )$ is

A) -4
B) $- \frac { 7 } { 2 }$
C) $\frac { 1 } { 2 }$
D) $- \frac { 1 } { 2 }$
E) 4