Whats the conversation mainly about？A．A more economical diesel fuel.B．Characteristics of a

Whats the conversation mainly about？

A．A more economical diesel fuel.

B．Characteristics of a new type of fuels.

C．Where a new energy source is located.

D．How to develop alternative energy sources.

请帮忙给出正确答案和分析，谢谢！

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