For the Function, Find the Average Rate of Change of F

Multiple Choice

For the function, find the average rate of change of f from 1 to x: $\frac { f ( x ) - f ( 1 ) } { x - 1 } , x \neq 1$
-f(x) = -8x

A) -8
B) 0
C) $\frac { - 8 } { x - 1 }$
D) -9