Why is the road most slick when it first begins to rain?

A. Oils the road has absorbed begin to float.

B. The water has not had time to run off.

C. A higher concentration of dirt makes the road more slick.

D. None of the above

A. Oils the road has absorbed begin to float.

Explanation:

Oil tends to float on water, so any oil on the surface of the roadway will tend to float on the film of water that forms when rain starts. After it has been raining for a while, the runoff will have removed much of the oil.