What was the ultimate result of Zheng He's voyages of discovery in the 1400s?

a- expanding China overseas
b- spreading the Japanese language
c- spreading the Islamic religion
d- expanding trade with Native Americans

http://www.google.com/search?source=ig&hl=en&q=Zheng+He%27s+voyages&btnG=Google+Search

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OK, I

Sorry, I pressed the wrong button. I think the answer is a.