Which of the Following Is an Example of an Unethical

Which of the following is an example of an unethical business activity?

A) The employee uses the company computer to check his results in a network auction.
B) The employee did not report his supervisor for taking several illegal deductions on his income tax report.
C) The employee told several jokes that demeaned Polish people.
D) The salesperson allowed the customer to believe that delivery would be within the next week when the salesperson knew that delivery was at least four weeks away.
E) All of the above are examples of unethical business activities.