Which scenario would not require the rejection of takeoff?

The scenario of maintaining control of the aircraft would not require the rejection of takeoff. This is because if the pilot is able to maintain control during the takeoff roll and there are no other immediate threats or emergencies affecting the safe operation of the aircraft, then continuing the takeoff may be considered safe. The ability to keep the aircraft stable and on course is crucial, and as long as control is being effectively managed, pilots would typically continue with the takeoff.

In contrast, the other scenarios involve critical emergencies. Experiencing a fire or detecting smoke are serious situations that necessitate an immediate rejection of takeoff to ensure the safety of everyone on board. Engaging emergency procedures is indicative of an immediate threat and also would generally result in a decision to reject takeoff to follow appropriate protocols and maintain safety.