Answer: A
Explanation: Warm fronts cause snow flurries in the winter, while cold fronts cause several days of rainy weather so (C) wouldn’t be it. (D) is to Vague so it doesn’t best describe what occurs in a warm front. Last, (B) is wrong since the weather DOES change in a warm front. That leaves us with (A), so (A) is the correct Answer.
(Hope this helps! )