Find the Average Rate of Change of the Function from X₁

Multiple Choice

Find the average rate of change of the function from x₁ = 1 to x₂ = 3.? $$f ( x ) = x ^ { 3 } - 8 x ^ { 2 } - x$$ ?

A) The average rate of change from x₁ = 1 to x₂ = 3 is 19.
B) The average rate of change from x₁ = 1 to x₂ = 3 is -20.
C) The average rate of change from x₁ = 1 to x₂ = 3 is 8.
D) The average rate of change from x₁ = 1 to x₂ = 3 is -14.
E) The average rate of change from x₁ = 1 to x₂ = 3 is 14.