The supply chain includes a. suppliers and suppliers' suppliers. b. all entities that facilitate product distribution. c. suppliers, producers, intermediaries, and customers. d. buyers, sellers, marketing intermediaries, and agents.

The correct answer is option b. all entities that facilitate product distribution.

Explanation:

A supply chain is an integrated network between the company and its back end distributors. It is their responsibility to supply the manufactured product to the end customer.

This closely knitted network consists of different people, activities, entities, information systems, resources and channels.

For example an example of supply chain activity would be farming. From crops to the end customer.