Selling Price and Amount Spent Advertising Were Entered into a Multiple

Selling price and amount spent advertising were entered into a multiple regression to determine what affects flat panel LCD TV sales. A multiple regression model was fit
To the data and the graph of residuals shows a unimodal and symmetric pattern. What
Does this graph suggest?

A) the nearly normal assumption is satisfied.
B) the randomization condition is satisfied.
C) the linearity condition is satisfied.
D) both A and B.
E) both A and C.