What is the primary function of the transmission system?

The primary function of the transmission system is to transmit power from the engine to the wheels, allowing for different speed and torque outputs. This ensures that the vehicle can operate efficiently at various speeds and under different driving conditions. The transmission achieves this by adjusting the gear ratios, which play a crucial role in how power from the engine is effectively utilized to move the vehicle. By allowing the engine to operate within its optimal range while providing the necessary torque to the wheels, the transmission system is essential for both performance and drivability.

The other options do not accurately describe the primary role of the transmission. The audio system relates to entertainment features within the vehicle, fuel efficiency management involves various aspects of engine operation and driving style rather than the transmission itself, and filtering exhaust gases is a function fulfilled by components of the vehicle's emissions system rather than the transmission. Therefore, the correct understanding of the transmission's primary role is vital for anyone studying automotive systems.