The answer is B. Equilibrium means a state in which opposing forces or influences are balanced.
An occluded front forms when a warm air mass is caught between two cooler air masses. The warm air mass is cut ofl or occluded' from the ground. The occluded warm front may cause clouds and precipitation. A swirling center of low air pressure is called a cyclone.
That they are random, constant, and straight -line motion.
