What are the three main types of airfoils?

The identification of the three main types of airfoils focuses on understanding the significant components of an aircraft that are specifically designed to create lift and control. In this context, the correct choice succinctly captures the essential airfoil designs utilized in aviation.

Wings are the primary airfoils of an aircraft, designed to generate lift through their shape and angle of attack as they move through the air. The horizontal stabilizer also plays a crucial role; it is typically placed at the tail of the aircraft and helps maintain the stability of the aircraft in flight. Furthermore, the inclusion of the propeller, although not a traditional airfoil that generates lift in the same manner as wings, operates on similar aerodynamic principles by creating thrust and contributing to overall flight dynamics.

Other options provided include components of an aircraft that may support flight but do not fit into the category of primary airfoil types. For example, ailerons, flaps, and elevators are control surfaces that modify the plane’s orientation but are not main types of airfoils in their own right. Hence, the selected answer effectively encompasses the essential, main types of airfoils that are central to an aircraft's operation in the air.