Answer:
B. her reservation price was at least $400.
Explanation:
Reservation price: It shows a limit on a price of purchase and selling of products and service rendering.
In the demand side, this price represents the higher price that the buyer is willing to pay to purchase the goods whereas, on the supply side, this price represents the lower price that the seller is willing to sell the goods.
In this question, the Shelly purchase a leather purse for $400 which means the minimum price would be $400
So, all other options except B are incorrect as option B is the most appropriate.