A rudder controls the movement of an aircraft around which axis?

The rudder is a crucial control surface located on the vertical stabilizer of an aircraft's tail. Its primary function is to control the aircraft's yaw, which is the movement around the vertical axis. When a pilot moves the rudder left or right, it alters the direction of the aircraft's nose, effectively enabling the aircraft to turn in that direction. Yaw is one of the three primary axes of rotation for an aircraft, with the other two being pitch (around the lateral axis) and roll (around the longitudinal axis). Therefore, identifying the vertical axis as the correct answer highlights the rudder's role in controlling yaw, differentiating it from the functions associated with the other axes.