Which of These Statements Regarding Quantity Discounts Is Most Accurate

Which of these statements regarding quantity discounts is most accurate?

A) Cumulative quantity discounts encourage repeat buying by a single customer to a far greater degree than do noncumulative quantity discounts.
B) Noncumulative quantity discounts encourage repeat buying by a single customer to a far greater degree than do cumulative quantity discounts.
C) Quantity discounts are primarily used to undercut competitors' prices.
D) Noncumulative quantity discounts encourage smaller long-term repeat purchases rather than less frequent large quantity purchases.
E) Quantity discounts are designed to reward wholesalers and retailers for marketing functions they will perform in the future.