Should all vehicles utilizing an internal combustion engine have a working muffler?

A working muffler is essential for all vehicles equipped with an internal combustion engine because it plays a critical role in reducing noise emissions. Mufflers help to diminish the sound produced by the engine's exhaust gases, ensuring that vehicles operate quietly and do not contribute excessively to noise pollution. This is particularly important in urban areas and residential neighborhoods where loud noises can be disruptive.

Additionally, mufflers assist in lowering harmful emissions by controlling the exhaust flow, which can help improve the overall efficiency of the vehicle. Many jurisdictions require vehicles to be equipped with functioning mufflers to comply with noise and environmental regulations, making it not just a matter of performance but also of legal compliance.

The other options suggest that either some vehicles are exempt from this requirement or that specific types of engines must have mufflers, but this does not acknowledge the universal necessity of mufflers for all internal combustion engines regardless of fuel type. Thus, every vehicle with an internal combustion engine must indeed have a working muffler.