What is the best way to influence decisions towards a greener workplace when purchasing computer equipment?

Your company operates a decentralized purchasing model for computer equipment. Individual departments or groups make their own selections as long as they stay within budget.

What is the best way to influence decisions towards a greener workplace when purchasing computer equipment?
A . Arrange a meeting with the IT department to show them a list of green vendors.
B. Establish centralized purchasing so that the company as a whole goes green.
C. Focus on education and persuasion of the individual departments or groups to ensure greener purchasing.

Answer: C