Which of the Following Is a TRUE Statement About Sales

Which of the following is a TRUE statement about sales mix?

A) Profits may decline with an increase in total dollars of sales if the sales mix shifts to sell more of the high contribution margin product.
B) Profits may decline with an increase in total dollars of sales if the sales mix shifts to sell more of the lower contribution margin product.
C) Profits will remain constant with an increase in total dollars of sales if the total sales in units remains constant.
D) Profits will remain constant with a decrease in total dollars of sales if the sales mix also remains constant.