To what should you pay attention if you want to take a passenger on the motorbike?

The selection of all three options is essential for safely taking a passenger on a motorbike under German law.

1. **Protective Clothing**: It's a legal requirement that both the rider and passenger wear appropriate protective clothing to minimize injury risks in case of an accident. This reflects the commitment to safety for all occupants.

2. **Chassis Adjustment**: Adjusting the chassis is crucial because the added weight of a passenger affects the bike's handling and stability. Ensuring the chassis is set correctly helps maintain safe maneuverability.

3. **Tyre Inflation Pressure**: The correct tyre pressure is vital for optimal grip and performance. A passenger changes the motorcycle's weight distribution, and failing to adjust the tyre pressure can lead to dangerous riding conditions.

Understanding and adhering to these regulations enhances safety on the road and complies with the Verkehrsordnung (traffic regulations) in Germany. All aspects must be considered for a safe ride with a passenger.