Final answer:
A non-conductive, nylon tagline should be used near power lines to prevent electrical hazards. Conductive materials like metal must be avoided to ensure safety.
Step-by-step explanation:
When working near power lines, it is crucial to use a non-conductive tagline to avoid the potential for electrical conduction which can lead to electric shocks or electrocution. The best choice amongst the given options for a tagline would be A. Nylon tagline, as nylon is a non-conductive material. Metal, conductive, and even insulated taglines can still carry current, which makes them unsafe for use around electrical hazards. To ensure safety, only materials that do not conduct electricity should be used near power lines.