The Instantaneous Rate of Change Of $f ( x ) = 3 \sqrt { x + 5 }$

Multiple Choice

The instantaneous rate of change of $f ( x ) = 3 \sqrt { x + 5 }$ at c = 4 is

A) $- \frac { 3 } { 2 }$
B) $- \frac { 1 } { 2 }$
C) $\frac { 1 } { 2 }$
D) 1
E) $\frac { 3 } { 2 }$