(See Graphs of Model a - D)The Scatterplots Show the Estimated

(See graphs of Model A - D) The scatterplots show the estimated residuals plotted against predicted values of the dependent variable.Which model is LEAST likely to have violated the assumption var(y_i) = var(e_i) = $\sigma$ ²?

A) Model A
B) Model B
C) Model C
D) Model D