Which of These Is Most Likely to Help a Company's

Which of these is most likely to help a company's employees act ethically?

A) a statement, translated into relevant languages, affirming that the company supports ethical behavior
B) a code of conduct that encourages employees to be loyal
C) a code of conduct that encourages ethical behavior but avoids listing penalties that might worry employees
D) a corporate culture that supports and rewards ethical behavior from the top of the organization downward