Thanks Team. It is clear now.

I see that the translation of our Dutch-language question is not correct.

This is the question:

There is a thick fog and you park the car on the road.
What’s wrong?

A. The rear fog light may be on.
B. The parking lights and the red rear lights must be lit.
C. The front fog lights may be on.

Q:There is a thick fog and you park car on the road. What's wrong?

A. The rear fog lights must be lit
B. PArking lights and rear fog lights must be lit.
C. The front fog lights must be lit.

Please expalin in detail as other answers did not help.

My question:

A option is wrong: It is not mandatory to switch on rear fog while parking but it is allowd. ( it is mandatory only when driving and visibility is less than 100 when snow and fog but it is mandatory while driving in rainfall)

B option is wrong: Parking lights and rear lights need not lit but it is allowed.

C option is wrong: It is obviously not mandatory as it is not mandatory in the car as well.

In options A and C must word is used. So, both options are wrong.

All options here are false so please tell me how A and C options are correct according to you.

Regards,