Fresh Direct, an online grocer delivering to homes and offices in and around New York City, recently switched its entire fleet to biodiesel trucks. These trucks run on used cooking oil rather than gas, drastically reducing the company's carbon dioxide footprint. Fresh Direct has developed a(n) ________.
A) indirect marketing channel
B) green supply chain
C) tying agreement
D) intermodal transportation system
E) exclusive dealing system
Answer: B