Which statement about transmission lines is true?

• A. They are always overhead
• B. They can be overhead or underground
• C. They are always underground
• D. They cannot be buried

Answer: (B)

Transmission lines can be installed either overhead on towers or buried as underground cables. The choice depends on factors like cost, right-of-way, reliability, and environmental or urban constraints. Overhead lines are common because they’re cheaper to install and easier to repair, but they need space, can be affected by weather, and are visually intrusive. Underground lines avoid weather exposure and reduce visual impact, but cost more and are harder to install and fault-find. Since both methods are used in practice, the true statement is that transmission lines can be overhead or underground. The other options—always overhead, always underground, or cannot be buried—aren’t accurate.