How did ming china impact global trade?

From 1405 to 1450, seven major trading trips of the Ming Dynasty led to the opening of many trade routes, connecting not only China but all of Asia with the Muslim countries of the Middle East and many African countries. These trips were under the command of the Emperor Zhu Di, and would allow the Chinese to explore new territories and thus be able to establish trade and diplomatic agreements with kings and emperors of distant lands. The fleet was built great and full of treasures on the ships, along with many ambassadors, with the intention of astonishing the kings of the lands visited and earning their tributes. Historically, journeys of the Ming dynasty travel served as a first way of uniting Asia, the Middle East and Africa, as well as the exchange of different materials, customs and technologies, along those journeys.

Im pretty sure the answer is d.) is more densely populated.