According to the last paragraph, what can be concluded？A．Solar and wind energy systems cos

According to the last paragraph, what can be concluded？

A．Solar and wind energy systems cost a lot for producing electricity.

B．People had better pay for the utility instead of producing electricity.

C．Solar and wind energy can provide cheap and continuous electricity.

D．Solar and wind energy is reasonable and cheap for remote villagers.

请帮忙给出正确答案和分析，谢谢！