What can contribute to environmentally-friendly driving?

The selected combination (1, 2, 3) is correct because all three options contribute significantly to environmentally-friendly driving practices.

1. Attending practical driving training can help drivers learn techniques that reduce fuel consumption, such as smooth acceleration and deceleration, which are encouraged by the German Verkehrssicherheitsrat (Road Safety Council).

2. Using vehicles with electric drives supports Germany's goals for reducing carbon emissions, aligning with national policies to promote sustainable and eco-friendly transportation.

3. Forming car pools decreases the number of vehicles on the road, thereby reducing traffic congestion and lowering overall emissions, which aligns with the principles outlined in Germany's traffic and environmental regulations.

Combining these approaches amplifies their benefits, resulting in more effective strategies for reducing the environmental impact of driving.