Which Mongol leader built enormous ships and welcomed traders to China's ports, bringing people from all parts of the world and providing China with notable economic progress? Genghis Khan Kublai Khan both a and b none of the above

Kublai Khan ...

I believe that it's Genghis Khan, since he founded the Mongol Empire and maybe therefore opened it's ports and expanded. Kublai Khan was a later emperor of the Mongol Empire, but he too could've opened the ports to increase economic profit of the empire.