Final answer:
The statement regarding high-voltage wires being wrapped in insulating material is false; they are held by insulating connectors but are not wrapped, relying on air for insulation. the correct option is (b).
Step-by-step explanation:
The statement is false. The high-voltage wires you see on tall metal-frame towers, also known as transmission lines, are indeed held aloft by insulating connectors to prevent the current from traveling down the towers. However, these wires are not wrapped in an insulating material. Instead, they are bare, relying on the air around them and the insulating properties of the connectors to prevent the electricity from grounding.
The reason for this is because insulating materials can deteriorate under the high voltage and environmental conditions these wires are exposed to, and the air provides sufficient insulation at the high distances from the ground and other structures.