Which of the Following Is the Best Example of Rent-Seeking

Which of the following is the best example of rent-seeking behavior?

A) Voters consider a ballot measure that would increase taxes to better fund schools.
B) Students at a university lobby the administration to improve dorms and reduce class sizes without increasing tuition.
C) Consumers try to get flying cars produced by telling automakers they are willing to pay for them.
D) Senators vote for what their constituents want so they can get reelected.