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During the 1950s, the American environmental preservation movement was mobilized byA. a proposed dam on the Green River in Echo Park, Utah.B. the construction of a dam in the Hetch Hetchy Valley at Yosemite National Park. C. the diverting of water from Owens Valley to Los Angeles, California.D. the growing proliferation of nuclear power plants.E. the nuclear incident at Three Mile Island.

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