A. Necropolis (this is the answer)
This naturally led to the diffusion of multiple inventions, both those of the Mongols and those ideas the Mongols usurped from cultures they conquered. While the Mongols profited from the trade of silk and tea from China to Europe, they also spread the Chinese inventions of printing and paper.
China joining WTO is a major step in its economic development. This is because it enabled China to capture many markets and attract foreign investment which contributed to the loss of millions of jobs in the Western World. As a result of opening its borders, China experienced unprecedented economic growth
I just need points The the answer is C
