What weather condition is associated with a low-pressure system?

The correct choice indicates that low-pressure systems are typically associated with poor visibility and numerous clouds.

Low-pressure systems often result in upward air movement, which cools the air and leads to the condensation of moisture. This creates clouds and can produce precipitation, leading to poor visibility. These systems are often linked with stormy weather, including rain or snow, as air masses rotate around the low-pressure center and can draw moisture from other areas.

Understanding low-pressure systems is essential for pilots as these conditions can significantly affect flight operations, including takeoffs and landings due to reduced visibility and cloud cover.

This contrasts with the other options, which suggest conditions of good visibility or clear skies, which are more consistent with high-pressure systems associated with descending air that discourages cloud formation.