Which of the following scenarios demonstrates the concept of free-riding?
A. The local church offers free meals during a national holiday.
B. A school fundraiser raffles off a free trip to Hawaii. Many people purchase raffle tickets, but there is only one winner.
C. Everyone can listen to public radio (which runs on donations), whether they have given a donation or not.
D. A toll bridge in New Jersey requires that every car crossing the bridge pay a toll.