which of the following is an unethical behavior for a salesperson?

A. telling the customer that the low-price item they want is unavailable so they will have to buy a more expensive product.
B. finding out what types of products the customer like so you can show the things they will be more likely to buy.
C. negotiating a price with the customer who does not wish to pay the "list price"
D. emphasizing only teh best features of a product during the sales presentation.