Explanation: Water in a waveguide acts as an impedance mismatch, causing a significant portion of the transmitted RF energy to reflect back towards the antenna. The radar receiver interprets these strong, continuous reflections as stationary targets very close to the radar's origin point. On a Plan Position Indicator (PPI) display, these reflections manifest as large, circular rings near the center, indicating the consistent echo from the water-filled section of the waveguide. * **A) Spoking** typically indicates interference or internal radar issues, not water. * **C) Loss of range rings** suggests a display or calibration fault, not reflections from water. * **D) Wider than normal targets** points to resolution issues or very large actual targets, not specific to water in the waveguide.