Find the Average Value of the Function $f ( x ) = \frac { x } { 4 x + 1 }$

Multiple Choice

Find the average value of the function $f ( x ) = \frac { x } { 4 x + 1 }$ over the interval [1, 3]. Round your answer to two decimal places.

A) 0.28
B) 1.22
C) 0.44
D) 0.22