What happens along a stationary front?
a. cold air rises over warm air.
b. the flow of air is neither toward the warm air mass nor toward the cold air mass.
c. air moves so rapidly upward that hurricanes form.
d. wind stops completely.

b. The flow of air is neither toward the warm air mass nor toward the cold air mass.

A stationary front forms between two air masses. A stationary front results when the warm front or cold front air stops moving. This occurs due to the fact that warm front and cold front air masses being opposite to each other but neither of them are able to repel the other. This affects the climatic conditions of the region. The weather is often cloudy along a stationary front and also supported with fall of rain and snow especially if the air in the front is cold with low atmospheric pressure.

Therefore, along a stationary front the flow of air is neither toward the warm air mass nor toward the cold air mass.