To Get the U

To get the U.S. Senate to pass a farm bill, a U.S. senator from a farm state asks for the support of a U.S. senator from an urban state. The urban-state senator agrees to support the bill, if in return the farm-state senator supports a bill for a mass transit project. This situation is an example of

A) the paradox of voting.
B) rent-seeking behavior.
C) political logrolling.
D) the median voter model.