Which of the Following Practices Is Most Likely to Be

Which of the following practices is most likely to be viewed by both salesperson and customer as unethical?

A) The salesperson gives the customer a cut glass paperweight with the company's name engraved on it at the end of December.
B) A salesperson gives a potential customer tickets for front-row seats at a sold-out concert of the potential customer's favorite singer.
C) The company throws an annual party for its clients at company headquarters that includes a buffet and open bar.
D) At a software convention,a software sales rep takes its top five clients out for dinner at an expensive steakhouse.
E) A railway company gives all of its vendors a 20% discount on passenger rail services.