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Forests and Railroads

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The Training of a Forester, Gifford Pinchot
The following is an excerpt from a manual on training a forester.

Pinchot, Gifford. The Training of a Forester. Philadelphia;London: J.B. Lippincott, 1914. WorldCat [OCLC]. Web. 25 Mar. 2016.

What is the purpose of the final sentence in paragraph 2?

A

It emphasizes how the railroad was far superior to any other transportation system.

B

It highlights the reliability of the American railroad.

C

It explains the intricate workings of train track connections.

D

It underscores the importance of wooden railroad ties.