The answer is C William booth
Explanation: I think you neeed to answer that on your own, cause only you know the story.
Medieval doctors learn treatment from Romans
This plan was called the "Open Door Policy". This policy was proposed by the USA in 1899. Under this, all western nations would have equal opportunities to trade in China. Thiss was in support of Chinese territorial and administrative integrity. It lasted for 40 years and it became the foundation for the American foreign policy in East Asia at that time.
Yea that other guy doesn’t help; the Pax Mongolia was a peace period for the Mongols, kinda like the Pax Romana; a golden age in short