What could the driver do if a fire started in the trailer being pulled by their vehicle?

Answer: B — Disconnect the tractor from the trailer and separate the units

If a fire starts in the trailer being pulled by the vehicle, the driver should immediately disconnect the tractor from the trailer and separate the units. This is the safest option as it prevents the fire from spreading to the vehicle and potentially causing further damage or injury. Continuing to drive to the nearest fire station is not recommended as it could put the driver and others on the road at risk. Pouring water over the fire may not be effective or safe, as it could spread the fire or damage the contents of the trailer. Ignoring the fire is also not a safe option, as it could continue to grow and become more dangerous.