In paragraph 7, why does the author mention that there is abundant archaeological evidence for the extinction of the New Zealand moa? A. To show that extinctions occurred in areas other than North America. B. To challenge Martin's claim that the lack of megafauna remains supports his model of the megafauna extinctions. C. To identify a country where humans were highly skilled as hunters. D. To help explain why it is unclear whether all large herbivores of late Pleistocene America became extinct after the appearance of Clovis.