Why is "the first rain" dangerous for drivers?

1. A"The first rain" is no different from ordinary rain and therefore there is no difference in the level of danger.
2. B"The first rain" causes the road to be slippery due to the dust and dirt that has accumulated on it.
3. C"The first rain" is dangerous only because of the wind that tends to divert the vehicle from its course.
4. D"The first rain" improves the grip of the tyres on the road and causes rapid tyre wear.

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