Which of the following are examples of renewable energy sources?

• A. Coal and Oil
• B. Solar and Wind
• C. Nuclear and Gas
• D. Wood and Coal

Answer: (B)

Renewable energy sources are those that can be replenished naturally on human timescales and typically produce little or no direct emissions during operation. Solar power uses energy from sunlight, and wind power uses energy from moving air; both rely on ongoing natural processes, so they don’t deplete like fossil fuels and they reduce greenhouse gas emissions when generating electricity. The other options rely on fossil fuels (coal, oil, gas) or non-renewable fuel cycles, so they aren’t considered renewable in usual classifications. Solar and wind thus stand out as clear examples of renewable energy sources.