Question refers to the excerpt below."For each of us, as for the robin in Michigan or the salmon in the Miramichi, this is a problem of ecology, of interrelationships, of interdependence. We poison the caddis flies in the stream and the salmon runs dwindle and die. . . . We spray our elms and the following springs are silent of robin song, not because we sprayed the robins directly but because the poison traveled, step by step, through the now familiar elm leaf-earthworm-robin cycle. These are matters of record, observable, part of the visible world around us."Rachel Carson, Silent Spring, 1962Which of the following developments contributed most directly to the conditions described in the excerpt?AThe erosion of soil on the Great PlainsBThe growth of suburban housing on previously undeveloped landCThe increase in government regulation of natural resourcesDThe growth of higher education

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