Which of the Following Instances BEST Exemplifies the "Free Rider

Which of the following instances BEST exemplifies the "free rider" problem?

A) unqualified candidates who are elected primarily because they share a ticket with a more prominent and popular candidate
B) incumbent political officials who exploit the privileges of their office to give themselves an advantage over their rivals
C) citizens who enjoy the benefits of a democratic system without actively participating in the democratic process
D) prominent citizens who use their political connections to lobby for legislation that benefits them personally
E) advocacy groups that pursue political goals through traditionally non-political means