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.
I believe your answer would be C! Hope this helps =]
Germany sunk it using their submarines.
The first alternative is correct (A).
A war is a terroir scenario, where the soldiers go through very difficult times. Many lose friends, see the suffering of people, children, anyway. That way, no matter how psychologically strong a soldier is, his emotional state is shaken.
The Vietnam War itself caused many traumas, as it was a very violent war with many deaths and mutilations. In this way, soldiers who have returned alive have gone through many psychological dramas, alcohol vices, drugs, to the point of needing rehabilitation programs.
