Final answer:
Option B: The broad pattern seen from Montana to New Mexico is a low-pressure system, characterized by rising moist air that forms clouds.
Step-by-step explanation:
On the same map, there is evidence of a broad low-pressure system across the region from Montana to New Mexico. Low-pressure systems occur when the earth's surface atmospheric pressure is lower than the surrounding environment, leading to the rising and condensation of moist air, which results in cloud formation. Such systems can have large effects on weather conditions, often instigating weather events. Isobars on a weather map indicate areas of constant pressure and help in the prediction and description of the weather. Weather maps use isobars to represent constant pressure areas, and gas moves from high to low-pressure areas, influencing weather conditions.
Regarding the movement of gas in terms of pressure on the same topic, gas moves from an area of high pressure to an area of low pressure. This concept is fundamental in understanding atmospheric dynamics and weather patterns.