Joellen's General Store advertises cans of X-brand whole tomatoes for $.33 per can, although she doe not have any in stock. When customers arrive to buy the tomatoes, Joellen tells them that her stock of X-brand canned tomatoes has been sold and that she cannot obtain more at the lower price. She then informs the customers that she has Y-brand canned tomatoes in stock, for $.55 per can, and that the Y-brand canned tomatoes are far superior to the X-brand canned tomatoes. What do you call Joellen's behavior?

A. Counter advertising

B. A cease-and-desist order

C. Bait-and-switch advertising

D. A violation of Regulation Z