Find the Average Rate of Change Illustrated in the Graph

Find the average rate of change illustrated in the graph.
-The rate of return of certain investments increases as the risk factor of the investment increases. An investment with a risk factor of 2 has a rate of return of 5.0%. An investment with a risk factor of 20
Has a rate of return of 12.0%. What is the average rate of change in return per unit of risk? Round to
Two decimal places.

A) 0.39% per unit risk
B) 2.57% per unit risk
C) 0.67% per unit risk
D) 1.50% per unit risk