What do steadying lines help maintain during a hoisting operation?

Steadying lines play a crucial role in maintaining the boat’s position and stability during a hoisting operation. When the boat is being lifted or lowered, the steadying lines help to prevent excessive movement, swaying, or rolling of the vessel. This stability is essential for ensuring the safety of both the crew and the equipment being hoisted. By providing support and control, steadying lines help keep the boat steady, allowing for a more accurate and secure lifting process. This is especially important in challenging conditions, such as rough waters or windy environments, where maintaining stability can be more difficult. Thus, option C emphasizes the primary function of steadying lines effectively.