The rear fog light must be used in the case of...

The rear fog light must be used in the case of...
A)sudden braking.
B)overnight frost.
C)dense clouds of smoke.Correct
REAR FOG LIGHT:
- Its installation and use is mandatory.
- It shall be red in colour.
- It shall be used, mandatorily, in the case of THICK fog, VERY heavy rain, HEAVY snowfall, or DENSE clouds of smoke or dust.