Which of the following actions will not disengage the autopilot?

Adjusting the throttle will not disengage the autopilot because the autopilot is designed to retain control over the aircraft's flight path while allowing for throttle adjustments. When the pilot changes the throttle settings, the autopilot can adapt to those changes to maintain the set altitude, speed, and other parameters of flight control.

In contrast, other actions, such as pulling back on the yoke or pressing the disengage switch, directly interfere with the autopilot's operation. A smooth turn will typically engage the autopilot to follow the new flight path, but if the pilot makes an abrupt movement on the control surfaces, it can also lead to a disengagement. Thus, adjusting the throttle is a non-disruptive action that keeps the autopilot engaged, aligning with the aircraft's operational capabilities.