The conductors of the overhead lines are

The correct answer is Option B: stranded
Here's why:
Solid conductors are generally too rigid and inflexible for overhead lines.
They would be prone to breaking due to vibrations, wind, and temperature changes.
Stranded conductors are made up of multiple wires twisted together.
This construction provides flexibility, making them less susceptible to damage from external forces.
The flexibility also makes them easier to handle and install.
Therefore, overhead lines use stranded conductors for better durability and ease of use.