Where are you particularly at risk during an overtaking manoeuvre here?

Your answer is fully correct, and here's why:

When overtaking a large vehicle like a truck, you are at particular risk in the truck’s wind-sheltered areas. These areas are zones where the airflow disturbed by the truck creates turbulence that can affect your vehicle's stability.

1. When driving into the truck’s wind-sheltered area (option 1), you might experience sudden changes in air pressure and turbulence that can push your vehicle or cause it to behave unpredictably.

2. When driving out of the truck’s wind-sheltered area (option 2), the airflow suddenly stabilizes again, which can cause your vehicle to jerk or swerve unexpectedly.

This is why both entering and leaving this zone are risky moments during overtaking. The third option, "when changing lane after overtaking," is generally a risk but not specifically related to the truck’s wind-sheltered area and thus not the main concern in this question.

Remember this when overtaking large vehicles: always be prepared for possible wind gust effects both when approaching and leaving the truck's area to maintain control safely.