When fueling a bus, what precaution should a driver take?

Answer: B — Turn off engines and avoid any sources of ignition

When fueling a bus, it is essential for a driver to turn off the engine and avoid any sources of ignition to ensure safety. Fueling is a task that involves highly flammable materials, and having the engine running creates a risk of ignition that could lead to a fire or explosion. Additionally, any other sources of ignition, such as open flames, sparks, or even static electricity, should be eliminated in the fueling area to further reduce the risk of an incident. Taking this precaution is a fundamental part of safe fueling practices that help protect the driver, passengers, and general public. Other choices, such as leaving the engine running or using a cell phone, could potentially increase the risk of accidents or hazardous situations during the fueling process. Checking the fuel gauge, while important for monitoring fuel levels, does not directly address the safety concerns associated with fueling.