Which of These Actions Conforms to the Definition of Corporate

Which of these actions conforms to the definition of corporate social responsibility?

A) A food company voluntarily recalls a product because of possible contamination
B) A U.S. tobacco company moves its production facilities to Asia to take advantage of lax regulation
C) Exxon's oil refineries adhere to the U.S. Clean Air Act
D) Ford negotiates with the United Automobile Workers to avoid layoffs
E) An apartment complex owner gives in to tenant pressures and hires a security guard