If an Airline Overbooks It Pays People Who Volunteer to Leave

If an airline overbooks it pays people who volunteer to leave the overbooked flight. This system is better than drawing randomly from a hat the people who should miss the flight because

A) those with the least to lose are the ones who miss the flight.
B) it gives everyone a chance to get money they hadn't counted on.
C) it is quicker and helps keep the flight on schedule.
D) it is the most equitable way of solving the situation.