Barter Is

Barter is

A) a reciprocity agreement stipulating that if company A purchases services from company B, then company B must purchase similar services from company A.
B) a tying agreement stipulating that if company A purchases a product from company B, it must also purchase one of its services.
C) the practice of exchanging products and services for other products and services rather than for money.
D) the practice of exchanging services for products of equal or greater value.
E) the practice of exchanging products and services for money.