​Pam, Pru, and Pat are deciding how they will celebrate the New Year. Pam prefers to go on a​ cruise, is happy to go to​ Hawaii, but does not want to go skiing. Pru prefers to go​ skiing, is happy to go to​ Hawaii, but does not want to go on a cruise. Pat prefers to go to Hawaii or to take a​ cruise, but does not want to go skiing. They decide to go to Hawaii.
What is the opportunity cost of the trip to Hawaii for each of them?

A. The opportunity cost for each of them is the airfare to Hawaii
B. The opportunity cost for Pam and Pat is a cruise and for Pru it is skiing
C. The opportunity cost for Pam and Pat is the airfare to Hawaii minus the cost of a cruise and for Pru, it's the airfare minus the cost of a ski trip
D. The opportunity cost for each of them is the airfare to Hawaii minus the cost of a cruise