Determine the Average Rate of Change of the Function on the Given

Multiple Choice

Determine the average rate of change of the function on the given interval.
- $f ( x ) = \sqrt { x + 1 }$ on $[ 0,3 ]$

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