According to Sun Yat-Sen, What Was Demonstrated by the Existence

According to Sun Yat-sen, what was demonstrated by the existence of different racial or ethnic groups in China?

A) China would be made stronger by having different groups, such as the Tibetans or Muslims, as part of their society.
B) It showed incomplete assimilation into Han culture.
C) Chinese nationalism was based on expelling the Manchus while accepting all other peoples within China's borders.
D) It showed that the Manchus had failed to completely conquer China.