1. D

→ Dẫn chứng: Christopher Columbus was born in Genoa, Italy in 1451

2. C

→ Dẫn chứng: While spending most of his early years at sea, Columbus began to believe that he could find a shortcut to the Indies by sailing west across the Atlantic Ocean.

3. B

→ Dẫn chứng: They gave him a crew and three ships, the Nina, Pinta and Santa Maria.

4. C

→ Dẫn chứng: Columbus' discoveries set the stage for the Age of Exploration, one of the most fascinating and exciting times in world history.