Which part of the aircraft houses the rudder?

The rudder is a critical component located on the vertical stabilizer of the aircraft. The primary function of the rudder is to control the yaw movement, which is the left and right rotation around the vertical axis of the aircraft. The vertical stabilizer itself acts as a fin that provides stability in the yawing motion and supports the rudder’s operation.

When the pilot inputs a command to turn the aircraft left or right, the rudder moves accordingly, creating a side force that helps the aircraft pivot around its center of gravity. This movement is essential for maintaining controlled flight, particularly during maneuvers and when adjustments need to be made to the aircraft's heading.

In contrast, the other options do not house the rudder. The horizontal stabilizer is where the elevator is located, which controls pitch rather than yaw. The fuselage is the main body of the aircraft and does not specifically contain any control surfaces for directing flight. Understanding the function and location of aircraft control surfaces, such as the rudder on the vertical stabilizer, is fundamental for grasping the principles of aircraft control and aerodynamics.