Answer:
I would say Metal
Explanation:
Technically, all 4 aren't renewable (but sunlight, water, and wind are considered renewable energy sources), but metal is the best choice
Metal ore will run out and cannot be recreated.
Reasons why I think all 4 aren't renewable
Sunlight will die in around 6 billion years
Water will evaporated in 6 billion years when the sun blows (if it even ever survives the global warming we're facing)
Wind will be gone when the earth is swallowed by the sun
