Under which circumstances will persons not be accepted for passage?

The correct answer is based on the understanding that various conditions can render individuals unfit for passage on a flight. Each of the provided circumstances—being unfit for travel, lacking a valid ticket, or arriving late to the gate—represents valid reasons for denying boarding to persons.

Being unfit for travel typically encompasses health-related issues that could pose a risk to the individual or others on the aircraft. This ensures the safety and well-being of all passengers and crew.

Not having a valid ticket is a straightforward requirement; without it, a person has no authorization to board, as tickets serve as proof of purchase and entitlement to a seat on the flight.

Arriving late to the gate can compromise the punctuality of the flight and disrupt operational schedules, hence individuals who are not present at the gate by the designated boarding time may not be allowed to board.

Therefore, acknowledging that each of these conditions can independently prevent a person from being accepted for passage, choosing all of these options collectively captures the comprehensive nature of this policy.