问题详情

What is the role of the 4th and 5th paragraphs in the development of the topic？

A．To further illustrate the trend of oil production in the U. S.

B．To provide supportive evidence for the trend of oil production.

C．To explain how the present condition come into being.

D．To give professional viewpoint on the present condition.

请帮忙给出正确答案和分析，谢谢！