Where do squall lines generally develop?

Squall lines are typically associated with the severe weather that forms ahead of cold fronts, making the option referencing their development between 50 to 300 miles in front of a cold front the correct choice. In this region, the atmospheric conditions are often ideal for the development of strong thunderstorms, including squall lines, due to the lifting of warm, moist air over advancing colder air. This lifting can cause rapid condensation and the formation of organized lines of storms characterized by strong winds, heavy rainfall, and potentially hail or tornadoes.

The other situations mentioned do not commonly lead to the development of squall lines. For example, while low-pressure systems can generate various weather phenomena, squall lines are especially a feature of advancing cold fronts, not located at the center of a low. Likewise, stationary fronts tend to produce more widespread rainfall rather than the highly organized and intense storms typical of squall lines. Occluded fronts, which occur when a cold front overtakes a warm front, also do not foster the same conditions that create squall lines; instead, they often lead to complex weather patterns that may not be as intense or organized as those associated with squall lines.