Leslie goes to a store to buy a dishwasher advertised at a great sale price only to find it is "sold out" (because only a few were available to begin with), and she ends up buying a more expensive dishwasher. This "bait and switch" system is an example of the technique.

Low - ball

Explanation: The low- ball technique could be explained as a trick used by sellers to lure consumers into making a purchase by offering an exciting and low priced product for sale. This offer gets the buyer or consumer committed to such product. However, these offer isn't one in which the seller really intends to uphold as it is just to get the buyers to commit, then the price is suddenly upped or increased at which point the committed buyer ends up paying the increased fee for such product. In the scenario above, only few low priced products were made

available as the seller does not intend to uphold the low price advertised with the buyer eventually purchasing at an increased price.

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it's obviously d. it could be c though.