In Which of the Following Situations Would a Consumer Most

In which of the following situations would a consumer most likely experience cognitive dissonance?

A) During a canned presentation, the prospect learns the Consumer Union has voted this product to be the best of its type on the market.
B) Two weeks after the purchase, the customer discovers another company sells the identical item for 20 percent less.
C) While closing the sale, the sales person satisfactorily answers all the prospect's objections.
D) After deciding to purchase the product, the customer learns the item has a lifetime guarantee.
E) During the sales presentation, the sales person drops the product on the floor to show that it is unbreakable.