An ice storm is a temperature below freezing resulting from large amount of snow falling, i.e., options A and B.
Freezing rain causes ice storms. Raindrops travel into a tiny layer of below-freezing air near the earth's surface, where they freeze on contact with the ground, trees, automobiles, and other things.
Ice forms when cold rain freezes in contact with surfaces below the freezing point.
Thus, the correct options A and B.
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