What role do flaps play during landing?

Flaps play a crucial role during landing primarily by increasing drag and decreasing stall speed. When flaps are extended, they alter the wing's shape and increase its surface area, which allows the wing to generate more lift at lower speeds. This characteristic is particularly important during landing, as aircraft approach the runway at reduced speeds.

The increased drag caused by flap extension helps the pilot control the descent rate more precisely, allowing for a steeper descent without gaining excessive speed. This combination of reduced stall speed and increased drag enables pilots to land the aircraft safely and efficiently, facilitating a smoother approach to the runway.

In contrast, other choices relate to aspects that are not directly connected to the primary function of flaps during landing. For instance, improving fuel efficiency is generally a consideration in cruise conditions rather than during landing, while stability in high winds can be affected by various aerodynamic factors beyond just the use of flaps. Additionally, increasing engine power is typically managed separately and is not a role performed by flaps. Thus, the role of flaps as described correctly highlights their significance in the landing phase.