Read the following text. Long ago, the Maya civilization thrived in what is now Mexico and Central America . They were building impressive cities when Europeans first arrived . The Maya were skilled astronomers, and they developed a complex calendar system. They could predict solar and lunar eclipses with remarkable accuracy. Years later, the Aztec Empire emerged as a new power in central Mexico, while the great cities of the Maya had declined. They founded their capital,Tenochtitlán, on an island in a large lake This city was growing rapidly when the Spanish conquistadors, led by Hernán Cortés , reached Mexico. The Aztecs were celebrating a great festival when Cortés and his men entered the city. Unfortunately, this was the beginning of the end for the Aztec Empire. What were the Maya doing when Europeans first arrived in the Americas? Choose the correct alternative. A They predicted solar and lunar eclipses. B They were building impressive cities. They founded Tenochtitlán. D They were celebrating a great festival.