The Ming Dynasty built large sailing vessels called junks to sail the Pacific and Indian Oceans. These ships were much larger than anything built by the Europeans. Why did Emperor Zhu Di build such large ships, and so many of them? Select one:
a. He wanted to show other nations that China was a very powerful and successful country.
b. Smaller ships might collapse at sea, and fewer ships were more open to attack.
c. The Chinese had unusual quantities of wood to use for building ships.
d. He planned to bring back thousands of slaves to work in the silk factories.