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According to paragraph 4, why is forest burning considered only a partial explanation for the disappearance of moa? A. Forest burning was far less intense on New Zealand's South Island, where the majority of moa habitats were located. B. Moa populations had already been significantly reduced before most of the forest burning started. C. Moa became extinct long after the Maori had stopped the practice of forest burning. D. Moa gradually adapted to changes that resulted from forest burning.