State one reason for using insulated gloves in line work.

Using insulated gloves in line work is essential primarily for protecting against electric shock when handling live electrical components. These gloves are specifically designed to provide a barrier between the wearer and electrical current, thereby minimizing the risk of injury or fatality that can occur when working near energized circuits. Insulated gloves are rigorously tested to meet safety standards and rated for different voltage levels, ensuring that they can effectively safeguard workers in high-risk environments.

While improving grip on tools, keeping hands warm in cold weather, and adhering to dress codes are relevant factors in some work settings, they do not address the critical safety need for protection against electrical hazards that insulated gloves provide. The main functionality of these gloves centers on electrical safety, making option B the most appropriate choice in this context.