In a Buyer-Seller Relationship, Reciprocity Refers to

In a buyer-seller relationship, reciprocity refers to

A) the practice whereby a seller requires the purchaser of one product to buy another item in the line.
B) an industrial buying practice in which two organizations agree to purchase each other's products and services.
C) an arrangement a manufacturer makes with a reseller to only handle its products and not those of competitors.
D) the illegal practice of refusing to purchase a seller's products unless the seller agrees not to purchase that product or any similar products from any other buyer.
E) when a supplier requires a buyer purchasing some of its products to also buy others.