The passage aims to______.A．list the factors that retarded the development of American rai

The passage aims to______.

A．list the factors that retarded the development of American railroads

B．illustrate the history of the development of American railroads

C．analyze advantages and disadvantages of American railroads at an early stage

D．present the pros and cons of American people in the 19th century

请帮忙给出正确答案和分析，谢谢！

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