The Slope of the Tangent Line $f ( x ) = - \frac { 1 } { 2 } x ^ { 2 }$

The slope of the tangent line $f ( x ) = - \frac { 1 } { 2 } x ^ { 2 }$ to the graph at the point (2,-2) is

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