Paul Ehrlich argued that overpopulation was responsible for environmental problems.
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The first national Earth Day marked the largest demonstration in American history.
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President Eisenhower asked the Public Health Service to study ways to control air pollution.
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The Santa Barbara oil spill led to reforms in the energy industry.

i think its the first one

answer: national resource conservation services

national resource conservation services is the us. based approach that provides technical and financial assistance for natural resource management. nrcs society in conservation of resources by involving in activities like farmland protection, flood prevention, watershed protection, urban conservation, conserves economic and environmental conditions. it conducts soil surveys and implements the policy of natural resources management on the society.

looks like the answer is     c     to me!