Publix, a Southeastern Grocery Store Chain, Has Signs Saying That

Publix, a southeastern grocery store chain, has signs saying that tips are not accepted and employees are all informed of this policy. However, many of the baggers commonly accept tips from customers anyway and they often compare to see who makes the most. The factor affecting the ethical behavior of Publix's employees is

A) individual.
B) social.
C) opportunity.
D) demographic.
E) internal code.