​For a Retailer Buying from a Wholesaler,volume Discounts Do Not

​For a retailer buying from a wholesaler,volume discounts do not violate the Robinson-Patman act because

A) ​To sell larger volumes,the retailer himself has to offer discounts
B) To sell larger volumes,the retailer has to incur costs in promoting the item
C) To sell larger volumes,the retailer has to hold the items in inventory longer
D) ​All of the above