What must be confirmed about the wheelchair ramp before use?

The correct answer highlights that the wheelchair ramp operates correctly when the fuel level is above 1/8 of a tank. This is important because many systems in vehicles, including ramps, may rely on hydraulic or electrical systems that require a certain level of fuel to function properly. Operating below this threshold may lead to performance issues or system failure, thus ensuring that the ramp can be safely deployed for passengers who require it. Understanding this allows the operator to take preventative measures to address any potential issues before they arise, promoting safety and reliability in assisting passengers.