Is a passenger car allowed to travel with adhesive sheets or sun curtains on the rear windows?
A)No, under no circumstances.
B)Yes, in all cases.
C)Only if the vehicle has two exterior rearview mirrors.Correct
# Explanation
Adhesive sheets or curtains on the rear windows are only allowed if the vehicle has **two functional exterior rearview mirrors**. This condition ensures that the driver has sufficient visibility of what is happening behind the vehicle, compensating for the loss of direct vision through the rear window. Without these mirrors, sun protection would not be permitted for road safety reasons.