Choose the correct answer:IV. It was a man who lived before the time of Christopher Columbus that was the world's first great traveler. His name was Marco Polo. With his father and his uncle, he traveled from Italy to China, crossing mountains and deserts to get there. In China a king called Kublai Khan was pleased to see the Polos and had them live near to him. They stayed for twenty-three years. Kublai Khan sent Marco to other countries to do business for him. When Marco finally returned to Italy, he wrote all about his adventures in a book, which was read by Columbus and many other people, who also became interested in traveling to strange countries.A. This story is mainly about -