B. settled in the Valley of Mexico around the year 1250.
D. found a permanent home on an island where an eagle tore apart a serpent.
Explanation:
The Aztec people established their civilization in the valley of Mexico. The Aztec settle in the Valley of Mexico for its surrounding volcanoes creating fertile soil.
According to the legend, the Aztecs once settle engaged in the permanent settlement in 1325 CE. They asked to look for the sign of an eagle holding a snake while standing on a cactus. They saw this similar sign on a marshy island and began to build a new town and their capital city as Tenochtitlan.
