If there is no dense fog, in what other circumstance can you use the front fog light?

A)On narrow stretches of road, with a signposted succession of dangerous curves.Correct
B)In any circumstance in which visibility decreases.
C)You can only switch on the front fog light in dense fog.
FRONT FOG LIGHT:
- Its installation and use is NOT mandatory.
- It will be white or selective yellow.
- It will be used voluntarily in the case of fog, heavy rain, snowfall, clouds of smoke or dust or in similar circumstances.
- It can also be used on narrow roads with many curves, that is, those that, having a carriageway of 6.5 m wide or less, are signposted with «dangerous curves» signs.
- Its installation and use is NOT mandatory.
- It will be white or selective yellow.
- It will be used voluntarily in the case of fog, heavy rain, snowfall, clouds of smoke or dust or in similar circumstances.
- It can also be used on narrow roads with many curves, that is, those that, having a carriageway of 6.5 m wide or less, are signposted with «dangerous curves» signs.