Question

if it starts to rain on a hot day, use caution because the pavement may be slippery for the first few minutes. this is due to
melting of tires.
water in the asphalt.
oil in the vehicle.
oil in the asphalt.

Explanation:

Asphalt contains oil - based binders. On a hot day, when it starts to rain, the water can mix with the oil in the asphalt, bringing the oil to the surface and making the pavement slippery for the first few minutes. Tires melting is not the cause. There is no significant water in asphalt and oil in vehicles is not relevant to the pavement's slipperiness at the start of rain.

Answer:

oil in the asphalt.