What Happens When the Warm Air Rises at a Cold

Multiple Choice

What happens when the warm air rises at a cold front? ​

A) The warm air expands and warms, producing clear skies.
B) It compresses the cold air below, causing rainclouds to form.
C) The warm air becomes compressed, causing clouds to form.
D) The warm air expands and cools, often causing storm clouds to form.
E) It compresses the cold air below, warming it until both temperatures are equal.