Which weather phenomena should be avoided for safe flight?

The correct choice highlights critical weather phenomena that pose significant risks to flight safety. Thunderstorms can produce hazardous conditions such as severe turbulence, lightning, hail, and sudden changes in wind direction and speed, which can greatly affect aircraft performance and control. Low visibility can impair a pilot’s ability to navigate and execute takeoffs and landings safely, increasing the risk of accidents. Severe turbulence can make it difficult to maintain control of the aircraft and can also lead to injuries for passengers and crew.

While other options mention factors like high winds or cloudy conditions, they do not encompass the comprehensive range of hazards associated with thunderstorms, low visibility, and severe turbulence, which can collectively create challenging flying conditions that are best avoided. Clear skies and even cloudy conditions may not necessarily represent a threat, and high winds, while needing careful consideration, do not inherently lead to as many potential dangers as the combination of thunderstorms, low visibility, and severe turbulence does. Thus, this choice emphasizes the most critical weather situations that should be avoided to ensure flight safety.