The Theme of "Green Eggs and Green Ham",referencing the Thinking

The theme of "Green Eggs and Green Ham",referencing the Thinking Green box in Chapter 11 is:

A) green employees need mentors.
B) the right food not only increases brain power and productivity of workers,but it may create cost savings for employers and be better for the environment.
C) providing a hearty breakfast before each work shift is proving to be very costly for many businesses including airline companies and motivation companies that traditionally followed this course of action.
D) younger workers do better with health foods;while older workers become difficult if a company does not provide junk food in its vending machines.