After a night of​ karaoke, Tiffany forgets to set her alarm and sleeps through her Economics final exam.A. The Opp. cost of Tiffanys decision is the price to retake the examB. The Opp. cost of Tiffanys decision is the value of everything she could have done instead of staying out lateC. The Opp. cost of Tiffanys decision is a poor grade on the examD. The Opp. cost of Tiffanys decision is a better grade on the the examE. All of the above