Answer:
B. A cold front pushes warm air upward, and the cold front collides with a cold front
Step-by-step explanation:
An occluded front occurs when a cold front overtakes a warm air front causing the warm air to move upward. Then, the cold front collides with another cold front which was ahead of the warm front. This phenomenon usually occurs in areas where the atmospheric pressure is low.
Precipitation occurs in the clouds and when the front is over the sky becomes clearer. Occluded fronts are represented with a purple color in maps.