Senator A agrees to vote for Senator K's state project in exchange for Senator K voting for Senator A's state project.This is an example of:

A) logrolling.
B) the paradox of voting.
C) the principal-agent problem.
D) the median voter model.

Logrolling

The practice of exchanging favors, especially in politics, by reciprocal voting for each other's proposed legislation.

State Project

Initiatives or programs undertaken by a government or public sector entity designed to achieve specific objectives, often relating to infrastructure, social, or economic development.