Explanation: S-band RADAR operates at lower frequencies (longer wavelengths) compared to X-band RADAR. Shorter wavelengths (higher frequencies), like those used by X-band, are more easily scattered and absorbed by atmospheric particles such as rain, snow, and fog. The size of these water droplets or ice crystals becomes comparable to the shorter X-band wavelengths, leading to significant signal attenuation and clutter. Conversely, the longer wavelengths of S-band signals pass through these smaller atmospheric particles with much less interaction, resulting in significantly less signal loss and interference from weather. This allows S-band RADAR to maintain better performance and detect targets more reliably in adverse weather conditions. Regarding the other options: B) X-band RADAR, with its shorter wavelength, can achieve a narrower beamwidth for a given antenna size, leading to *greater* bearing resolution, not less. C) S-band antennas often need to be physically larger than X-band antennas to achieve similar beamwidths, which can lead to *more* mechanical complexity, not less. D) Power output is a design characteristic, not an inherent advantage of one band over another, though some high-power applications might favor specific bands.