Marvin visits his aunt and uncle who live in Milwaukee. The Milwaukee Bucks basketball team is scheduled to play a home game against the Golden State Warriors during​ Marvin's visit. An online broker has a ticket for sale in Section 212 of the arena where the game will be played but the​ price, $75, is more than Marvin is willing to pay. From another online ticket broker he buys a ticket for​ $50 for a seat in Section 212 of the arena. On the day of the​ game, a friend of​ Marvin's uncle offers to pay Marvin​ $75 for his ticket. He declines the offer. ​Marvin's refusal to sell his ticket can be explained by A. his failure to ignore the sunk costs of the ticket. B. the endowment effect in which Marvin is not considering the nonmonetary opportunity cost of the ticket. C. his unrealistic view of his future behavior. D. his inclusion of the sunk costs of the ticket in his decision.