Explanation: "Sea return" refers to unwanted radar echoes caused by signals reflecting off wave crests, particularly at shorter ranges. This creates clutter on the radar display that can obscure actual targets. The "suppressor" control, more accurately known as Sensitivity Time Control (STC), is specifically designed to mitigate this issue. STC dynamically reduces the receiver's gain for a short period immediately after the radar pulse is transmitted. This significantly attenuates strong, close-in echoes like sea return, which are typically very strong due to their proximity. As time progresses (and the radar signal travels further out), the gain gradually increases back to normal, ensuring that targets at longer ranges are not affected. Reducing the overall gain control (B) would decrease sensitivity for *all* signals at *all* ranges, potentially making desired targets harder to see. Rotating the antenna for a deep null (A) is not a practical solution for general clutter reduction across a scanning sector and would cause loss of target information.