During the Open Stage of a Midlatitude Cyclone in the Northern

Multiple Choice

During the open stage of a midlatitude cyclone in the Northern Hemisphere,

A) a disturbance develops along the polar front with warm air converging and rising near the surface.
B) a faster moving cold front overtakes the slower warm front and wedges beneath it.
C) warm air moves northward along an advancing front,while cold air advances southward.
D) the lifting mechanism is completely cut off from the warm air mass.
E) occlusion occurs,resulting in precipitation.