​Business-to-business marketing involves buying and selling goods or services by which of the​ following?
A.
​Manufacturers, producers,​ retailers, consumers
B.
​Manufacturers, producers,​ retailers, wholesalers
C.
​Consumers, manufacturers,​ resellers, suppliers
D.
​Manufacturers, retailers,​ consumers, wholesalers
E.
​Manufacturers, producers,​ retailers, the government