While you didn't provide a lost of possible answers, the correct answer to this question would be, based on the following questions:
A The Mongolians lacked an orderly succession policy.
B The Chinese resented being ruled by a foreigner.
C European imperialism in Asia overcame Mongolian forces.
D Kublai's two failed invasions of Japan emptied the treasury and weakened his forces.
C - European imperialism in Asia overcame Mongolian forces. This is the correct answer because EU imperialism came a few centuries later.
