Why is it forbidden to install hard and protruding accessories in the passenger compartment?

1. AThey disrupt the stability of the vehicle.
2. BIn order to prevent obstruction of the passengers' field of vision when reversing.
3. CBecause in the event of an accident the accessories may injure the vehicle's passengers and the driver.
4. DIn order to prevent the possibility of damage to the vehicle's tyres.

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