What does having a weather radar listed as a MEL item require for a flight to be conducted?

When the weather radar is listed as a Minimum Equipment List (MEL) item, it indicates that the radar is not mandatory for flight provided certain conditions are met. Option B specifies that the flight can be conducted during daytime in Visual Flight Rules (VFR) conditions with no thunderstorms present.

This option is correct because the absence of thunderstorms is crucial to ensure the safety of the flight without the operational capability of the weather radar. The radar is primarily used to detect thunderstorms and severe weather, which could pose a significant risk to the aircraft if it’s not functioning. Daytime VFR conditions further contribute to safety as pilots can visually navigate and identify weather patterns more easily compared to nighttime flying.

The other choices suggest conditions that either do not provide sufficient safety assurances or conflict with regulations regarding flight with malfunctioning equipment. Therefore, option B correctly encapsulates the requirements under which a flight may safely proceed with the weather radar inoperative.