According to some estimates, at most for how long can we use the fossil fuel reserves？A．20

According to some estimates, at most for how long can we use the fossil fuel reserves？

A．20-50 years.

B．50-100 years.

C．100-120 years.

D．200-500 years.

请帮忙给出正确答案和分析，谢谢！

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