Which statement about China and trade is best supported by this passage

Multiple Choice Questions1.Which statement about China and trade does this passage best support?a)Trade between Europe and Cathay was greatly enhanced by the security established by theMongol and Ming Empires.b)Merchants rarely traveled between Tana and Cathany because the road was very dangerous.c)Cambalec was an important trading hub, but it was not a large city.d)The author felt the risks of trade with China outweighed the rewards.