What should team members provide for the reel person during guideline retrieval?

The correct choice emphasizes the importance of ensuring that the reel person has adequate lighting during guideline retrieval. Personal dive lights are crucial in cavern diving, especially in potentially low-visibility environments, as they allow the reel person to clearly see the guideline and navigate efficiently. Proper illumination helps avoid entanglement and ensures that the guidelines are retraced correctly.

The other options, while they may have some value in different contexts, do not directly assist the reel person in their specific task of guideline retrieval as effectively as personal dive lights. A backup guideline, for instance, is important for safety but does not directly aid in the retrieval process itself. Cheers and motivation can foster a supportive environment but do not contribute to the practical operational needs during guideline retrieval. Tracking devices can be useful in certain aspects of diving but are not essential for the immediate task of retrieving the guideline. Therefore, the provision of personal dive lights is paramount for both safety and efficient execution of the task at hand.