Find the Average Rate of Change for the Function Over $y=\sqrt{2 x}$

Multiple Choice

Find the average rate of change for the function over the given interval.
- $y=\sqrt{2 x}$ between $x=2$ and $x=8$

A) $-\frac{3}{10}$
B) 7
C) 2
D) $\frac{1}{3}$