What initiates the final approach before landing?

The correct choice of reducing speed as the initiator of the final approach before landing is grounded in the procedures that pilots follow during the landing phase of flight. During the final approach, the aircraft is aligned with the runway, and it is essential to reduce speed to stabilize the aircraft's descent and prepare for a safe landing. Lowering speed helps ensure that the plane is within the appropriate landing configuration, which includes lowering the landing gear and extending flaps for increased lift at lower speeds.

Speed reduction allows for better control of the aircraft and enhances the ability of the flight crew to make any necessary adjustments to the descent. It also prepares the aircraft to touch down gently on the runway. Properly managing the aircraft's speed during this critical phase enhances stability and safety as it transitions from the approach to landing.

In contrast, increasing altitude would take the aircraft away from the landing process, while descending rapidly could lead to instability and control issues. Executing a go-around, while sometimes necessary, signifies that the landing attempt is aborted; it does not initiate the final approach but rather indicates an adjustment in the approach strategy.