Why is maintaining a stable airspeed critical during takeoff?

Maintaining a stable airspeed during takeoff is critical primarily because it ensures that sufficient lift is generated for a safe ascent. As an aircraft accelerates down the runway, it needs to reach a specific speed known as the "takeoff speed," which is essential for creating the lift required to overcome the aircraft’s weight. If the airspeed is too low during takeoff, the wings will not generate enough lift, potentially leading to an unsafe situation such as a stall.

Maintaining this stable airspeed also helps the pilot manage the aircraft's performance characteristics more effectively. If the airspeed fluctuates or decreases unexpectedly, it can affect not only lift but also aircraft control and stability as it transitions from ground to flight. This stability is crucial for ensuring that the aircraft safely becomes airborne and can climb away from the ground, making option B the reason for its importance during the takeoff phase.