Where should the decal showing that a bus has been inspected be placed?

Answer: C — On the right of the windshield or on the right-hand side of the bus

Placing the decal on the left of the windshield (option A) would obstruct the driver's view and could potentially be dangerous. Placing it on the rear window (option B) would not be visible to the driver and would not serve its purpose. Inside the driver's door (option D) would not be easily visible to passengers and inspectors. The correct option is C, which provides visibility to both the driver and passengers. The wording of the question suggests that the decal should be placed on the right of the windshield, but it is also acceptable to place it on the right-hand side of the bus.