Which of the following lights are you allowed to use when you are driving a passenger car during a fog?

Why?

In fog, you may use front fog lights on their own or together with dipped headlights. Daytime running lights may replace dipped headlights only in normal atmospheric visibility, so A is incorrect. Using main-beam headlights alone does not meet the requirement to use dipped headlights or front fog lights in fog, so C is also incorrect.

art. 30 ust. 1 pkt 1 lit. a i art. 51 ust. 2 Prawa o ruchu drogowym