What component regulates the amount of water discharged from the rescue boat?

The throttle lever is the component that regulates the amount of water discharged from the rescue boat. It controls the engine's power output, which in turn affects the speed and performance of the boat's propulsion system. When the throttle lever is manipulated, it adjusts the engine's RPM (revolutions per minute), influencing how much water is expelled from the boat's propulsion system or outboard motor. This is critical in rescue operations, as managing water discharge effectively can help maintain stability and control during high-stress situations.

Other components listed, such as the steering wheel, fuel gauge, and rudder control, serve different purposes. The steering wheel directs the boat's course, while the fuel gauge simply indicates the level of fuel available, and the rudder control assists in maneuvering by altering the flow of water to change direction. None of these elements directly influence the amount of water discharged from the boat.