When is there a risk that the front wheel of the motorbike will lose contact with the carriageway?

Your answer is correct because in German traffic rules, the front wheel of a motorbike can lose contact with the road primarily when accelerating strongly, especially in a low gear (option 1). This is because the sudden increase in torque can cause the front wheel to lift. Additionally, accelerating while carrying a pillion passenger (option 2) increases the bike's load and affects its balance, making it more likely for the front wheel to lift under strong acceleration. Braking with the front-wheel brake (option 3), however, increases the downward force on the front wheel and generally does not cause it to lose contact with the road. Understanding these dynamics helps riders manage acceleration and braking to maintain stability and safety.