In winter in the alpine region of our province, the continuous cold weather keeps the temperature below 0℃ for a long time. The following are unrealistic: () A. It rains.

A, because the continuous cold weather keeps the temperature below 0℃ for a long time, raindrops in the sky will solidify and freeze on the road, so A is unrealistic;

B, road maintenance workers in order to remove the ice on the road, often sprinkle a lot of salt on the road, will reduce the freezing point of water, so that the road no longer freezes, which is practical;

C, drivers often add snow chains on tires to increase the friction between the car and the ground, which is practical;

D, drivers often add a certain amount of alcohol to the water tank to reduce the freezing point of the solution and prevent the water in the water tank from freezing.

So choose one