B and C are the right answers since you don't want to mix colors
Ans: The average rate of change of function =

(in fraction)
Explanation:The average rate of change of function =

Where
b = 8 (x's upper bound)
a = 0 (x's lower bound)

Hence the average rate of change of function =

(in fraction)
16r^2+ 2r -4r
16r^2 - 2r
2r ( 8r -1)