What measures help protect the environment?

The selected combination of low-resistance tyres and low viscosity engine oil is correct because both measures significantly enhance fuel efficiency, thereby reducing emissions and minimizing the environmental impact of vehicles.

Low-resistance tyres reduce the rolling resistance, which allows vehicles to consume less fuel, while low viscosity engine oil reduces internal friction in the engine, improving efficiency. These measures align with German traffic regulations that encourage environmentally friendly practices and aim to reduce air pollutants and greenhouse gas emissions.

The option of air-conditioning systems does not contribute positively in this context, as they often consume extra energy, potentially increasing fuel consumption and emissions. Therefore, focusing on low-resistance tyres and low viscosity engine oil is essential for an environmentally efficient vehicle, as recognized by German eco-friendly traffic standards.