coal, oil, and natural gas solar, oil, and geothermal wind, solar, and tidal natural gas, solar, and tidal
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which group of energy sources are ALL renewable?
Possibilities:
- coal, oil, and natural gas
- solar, oil, and geothermal
- wind, solar, and tidal
- natural gas, solar, and tidal

wind, solar, and tidal