Calculate the average rate of change for the graphed sequence from n = 2 to n = 6

Calculate the average rate of change for the graphed sequence from n = 2 to n = 6. Graphed sequence showing point 1, 17, point 2, 14, point 3, 11, point 4, 8, point 5, 5, and point 6, 2.

A) -9
B) -4
C) -3
D) -2