Which of the following is a main form of renewable energy?

• A. Coal
• B. Solar
• C. Nuclear
• D. Natural Gas

Answer: (B)

Renewable energy sources are those that can be replenished naturally and readily, so they don’t run out with use. Solar energy fits this because sunlight is abundant and continually available, and technology can convert that light into electricity without consuming the resource itself. That makes it a primary form of renewable energy. The other options rely on resources that are finite or not replenished on a human timescale: coal and natural gas are fossil fuels that release greenhouse gases when burned, and nuclear energy depends on uranium and generates long-lived radioactive waste, so neither is renewable.