Which of the following is NOT considered part of the auto body structure?

The axle is not considered part of the auto body structure. The auto body structure refers specifically to the outer shell of the vehicle and the components that directly provide its overall body shape and integrity. This includes parts like the floor pan, rear panel, and roof structure, which are integral to forming the body of the car and providing support and safety for occupants. The axle, on the other hand, is a mechanical component that is part of the drivetrain and suspension system—its primary function is to transfer power from the engine to the wheels and support the weight of the vehicle. This distinction makes it clear why the axle does not fall under the category of auto body structure.