Which of the following can be used to mark outdoor range safety lines?

Marking outdoor range safety lines is critical for ensuring safety during archery practice. Chalk is a practical choice for this purpose because it allows for clear, visible lines that can be easily applied and removed from the ground. It provides a temporary marking that can be adjusted or reapplied as needed, making it suitable for outdoor ranges where conditions can change.

Chalk is also non-intrusive and doesn't leave a permanent mark, which is beneficial for maintaining the integrity of the outdoor space. It effectively indicates boundaries without creating physical barriers, allowing for visibility while also maintaining a safe environment for archers.

Using materials like electrical tape might not be practical outdoors, as it can struggle to adhere well to uneven surfaces and may leave a residue when removed. Plastic cones, while useful for marking boundaries, are more permanent and can be moved or knocked over, which could compromise safety by misrepresenting the intended safety lines. Hence, chalk represents the most effective choice for marking outdoor range safety lines.