Find the Derivative of the Function $f ( x ) = 4 - 7 x ^ { 2 }$

Multiple Choice

Find the derivative of the function. $f ( x ) = 4 - 7 x ^ { 2 }$

A) $- \frac { 1 } { 7 }$
B) $14 x$
C) $\frac { 1 } { 7 }$
D) $- 14 x$
E) $7 x$