What do you lay the line back over after passing it through the chock?

The correct choice is the lifeline. In the context of maritime safety and rigging, after passing the line through the chock, it is standard practice to lay the line back over the lifeline. The lifeline serves as a safety measure that provides support and helps secure personnel on a vessel, thereby preventing falls or accidents during operations. It is essential for ensuring that lines are properly secured and maintaining safety onboard.

The lifeline can be used in conjunction with other lines, such as the guardian line, sea line, and anchor line, each serving specific purposes in different nautical applications. Understanding the correct application of these lines and their interactions is crucial in ensuring effective safety practices at sea.