Ernesto digs up wild ginseng. Then Alexis pays him for it, cleans it, dries it, weighs it, and calls Jamal to pick it up and drive it to a harbor. Then Claudia loads it onto a ship and transports it to China, where Thomas sells it to hundreds of customers in a shop. This is an example of how the ______ works.
a) Supply chain
b) Distribution network
c) Retail market
d) Production cycle