Which best describes the role of a "tag line" in rope rescue?

The role of a "tag line" in rope rescue primarily involves assisting in the management of the primary rope, especially when it comes to pulling and untangling it during operations. Tag lines are generally used to control the movement of the load and to help direct the rescue system more effectively. By ensuring that the primary rope remains manageable, the tag line helps reduce the risks associated with tangling which can complicate rescue efforts and create hazards for rescuers and victims alike.

In rescue operations, efficiencies in maneuvering the primary rope are critical, and tag lines facilitate this task, allowing teams to operate more effectively and safely. Therefore, the correct answer highlights the essential function of a tag line in ensuring the smooth operation of rescue systems.