What type of line should be rigged to control the pump's movement after it is in the water?

The correct choice is to rig a Control Line to manage the pump's movement after it is deployed in the water. A Control Line serves a vital function in manipulating the position and orientation of the pump while it operates, allowing crew members to make necessary adjustments safely and effectively. This is crucial in ensuring the pump is functioning optimally as it can be maneuvered as needed based on the situation, such as adjusting its depth or angle for maximum performance.

Other lines like Anchor Line, Securing Line, and Supporting Line may serve specific purposes, such as anchoring a vessel, securing equipment in place, or providing additional support, but they do not specifically denote the ability to control the movement of a pump in operation. Control Lines are specifically designed for this role, making them essential for operational efficiency and safety when handling equipment in a dynamic water environment.