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In paragraph 3, what is the author's purpose in describing the natural cycle of fires in ponderosa pine forests? A. To emphasize the importance of replanting seedlings after a forest fire B. To argue for increasing the effectiveness of laws to suppress forest fires C. To describe how fire affects a typical ponderosa pine forest in the absence of human intervention D. To explain the long-lasting damage that once occurred in the ponderosa pine forests of Montana before fires were controlled