You are carrying a load in your passenger car that protrudes from the rear — must you mark it?

A)No, it is not necessary for passenger cars.
B)Yes, but only at night or in adverse weather conditions.
C)Yes, with a panel placed at the end of the load.Correct
If the load protrudes from the rear, during the day, in clear weather and under normal visibility conditions, it must be marked with a 50 by 50 centimetre panel painted with alternating diagonal red and white stripes, placed at the rearmost end of the load so that it remains constantly perpendicular to the vehicle's axis.
If the load protrudes from the rear between sunset and sunrise, or in meteorological or environmental conditions that significantly reduce visibility, it must be marked with the panel or panels described above, whose surface is reflective, and with a red light.
If the load protrudes from the rear between sunset and sunrise, or in meteorological or environmental conditions that significantly reduce visibility, it must be marked with the panel or panels described above, whose surface is reflective, and with a red light.