The option about the ethnic composition of East Asia that is true is C. the Han Chinese comprise more than 90 percent of China's popiulation. Even today, they tend to call themselves by the name Han. A is incorrect because they were the same nation for many centuries. B is incorrect as they also come from island populations. D is incorrect because that number is much larger.
The correct option regarding the ethnic composition of East Asia is C, as the Han Chinese comprise over 90% of China's population. Options A, B, and D are inaccurate due to historical and demographic complexities. Understanding these distinctions helps clarify the diverse ethnic landscape of East Asia.
;