Which of the Following Is an Example of the Free-Rider

Multiple Choice

Which of the following is an example of the free-rider problem?

A) Sarah works overtime while her co-workers opt for a traditional schedule.
B) Tom listens to music on his local PBS radio station, but Tom does not contribute anything to PBS.
C) Katie catches a swordfish in the ocean.
D) Jethro buys a crayfish fishing licence that he refuses to share with his sister.
E) John attends a lecture on investing in high-tech companies for which he paid $100 to hear.