Final answer:
Hernán Cortés and his allies arrived at Tenochtitlan in 1519, after landing in Veracruz that same year and making their way to the Aztec capital.
Step-by-step explanation:
Hernán Cortés, the Spanish conquistador, commenced his march into the Aztec Empire after landing on the coast at Veracruz on April 22, 1519. Following a series of strategic alliances with local tribes and battles, Cortés and his forces arrived at Tenochtitlan, the heart of the Aztec Empire, that same year. Over time, due to a combination of superior weaponry, indigenous alliances, and European diseases, Cortés was able to conquer the capital. It wasn’t until 1521, after a brutal siege and significant struggle, that the great city of Tenochtitlan finally fell to the Spaniards, marking the end of the Aztec Empire.
The correct answer to the question “When did Cortés and his allies arrive at Tenochtitlan?” is B) 1519.