The answer is letter a. The Olmec culture is recalled today in part because it was the first Mesoamerican culture to build small cities, most particularly San Lorenzo and La Venta. It was said there were an abundant rainfall and seasonal flooding within the site the Olmec Civilization in those places.
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Explanation: His father, Aaron, is taken away by the Nazis on Kristallnacht and is sent to the Dachau concentration camp. When Aaron is released six months later, Josef, his mother Rachel, his sister Ruthie, and Aaron all board the St. Louis, which is set to take them to Cuba.