Consider a sequential game between a shopkeeper and a haggling customer. The party who moves first chooses either a high price ($50) or low price ($20) and the second mover either agrees to the price or walks away from the deal and neither party gets anything. Ignore costs and assume the customer values the item at $60. ​ If the shopkeeper goes first and quotes a high price, what is the best response of the customer? a. ​Swear off shopping forever b. ​Accept the high price c. ​Walk away from the deal d. ​Yell at the store owner