What’s the average rate of change...

Average Rate of Change is given by the Slope of the Function
We know that :
✿ [tex]\bold{Slope(m) = \frac{y_2 - y_1}{x_2 - x_1}}[/tex]
The Given Points are : (3 , -10) and (5 , -26)
Here : x₁ = 3 and x₂ = 5 and y₁ = -10 and y₂ = -26
[tex]\bold{Slope(m) = \frac{-26 + 10}{5 - 3} = \frac{-16}{2} = -8}[/tex]
✿ Option C is the Answer