The passenger car and the truck are on the 
According to the “Main road” sign (
Vehicles driving on a secondary road must give way to those driving on the main road (clause 96), so the bus will go last.
Since the main road changes direction at the intersection (clause 97), the passenger car and the truck drive through the intersection by the rules for intersections of equal roads. The driver of the passenger car must give way to the truck approaching from the right (clause 98).
Therefore, the correct order is: truck, passenger car, then bus.
Option 2. The bus is on the secondary road and must give way to those driving on the main road, so it cannot go first.
Option 3. The bus is on the secondary road and goes last, and the passenger car must give way to the truck approaching from its right.