What is the importance of the ground fault circuit interrupter (GFCI) on a school bus?

Answer: B — To protect against electrical shock and ensure passenger safety

The ground fault circuit interrupter (GFCI) is a critical safety device on a school bus designed to protect against electrical shock. It monitors the flow of electricity and can detect imbalances, which may indicate that current is leaking through an unintended path, such as a person touching a live wire. When such an imbalance is detected, the GFCI quickly interrupts the electrical circuit, significantly reducing the risk of serious injury or death from electric shock. This safety feature is particularly important in environments like school buses, where young passengers may be unaware of electrical hazards. By ensuring that the electrical system is safeguarded, the GFCI contributes to the overall safety of both passengers and drivers, making it an essential component of the bus's electrical system. The other options do not align with the primary function of the GFCI, as it does not relate to battery life, fuel efficiency, or monitoring passenger counts.