John Muir is best described as the father of the U.S. national park system.
He was an Scottish-American author that wrote many books about wilderness areas around California and the west coast.
Most of his books helped to preserve these areas and the Sierra Club which he founded is a prominent conservation organization.
Therefore, the Option B is correct.
Missing options "A. Father of the Enlightenment
B. Father of the American Industrial Revolution
C. Father of the U.S. national park system
D. Father of the Constitution"
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