Who Among the Following Is a Free Rider

Multiple Choice

Who among the following is a free rider?

A) Mickey buys groceries from the store where he works.
B) Donald rides to work with Betsey, but he pays Betsey for gasoline and other travel-related expenses.
C) Fred drives 20,000 miles a year on public streets, but he pays no more in property taxes than Barney, who only drives 1,000 miles.
D) Wilma watches many public television programs, but she has never sent in a contribution to the station.