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A least squares regression analysis of average gas mileage versus speed (mph) produces the following residual plot:

Based on the residual plot, which of the following statement(s) must be TRUE?

I. The relationship between speed and average gas mileage is non-linear.

II. The average gas mileage decreased as speed increased from $35$ mph to $60$ mph.

III. The regression equation would overestimate the average miles per gallon the car gets when the speed is $10$ miles per hour.

A

I only.

B

III only.

C

I and II only.

D

I and III only.

E

I, II, and III.

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