Which situation requires the cessation of all ground operations during thunderstorms?

The correct response indicates that all ground operations must cease when lightning is detected within a 5 nautical mile radius of the airport. This precaution is necessary to ensure the safety of personnel and equipment on the ground. Lightning poses a significant risk to individuals and can cause serious injuries or fatalities; hence, the established safety protocols call for immediate action.

When lightning is reported within this proximity, it typically indicates an increased likelihood of overhead storms, which could lead to unpredictable weather patterns and additional hazards. Therefore, halting ground operations is a standard safety measure taken to protect everyone involved, including pilots, ground crew, and any personnel in the vicinity.

Other scenarios, such as general weather warnings or reduced visibility, might not necessitate an immediate halt to all operations, as they can often be managed through different operational adjustments and safety protocols. However, the direct threat of lightning, particularly when it is close enough to warrant concern, supersedes other safety considerations and requires decisive action to mitigate risks.