D. The reason for the fall of the Maya civilization is still unknown. There are many different theories attempting to explain the cause of the Classic Maya collapse and the abandonment of Maya cities in the southern Maya lowlands of Mesoamerica between the 8th and 9th centuries: climate change, drought, deforestation, etc. but although the drought is the leading theory at the moment the truth is yet unknown.
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President Woodrow Wilson's 14 Points plan was a statement of principles for peace negotiations to bring a proper end to World War 1 and prevent future wars with point 14 being the formation of the League of Nations. So the answer is C.
