A. Vietnam was outside the sphere of Chinese influence, while Japan
was required to recognize Chinese superiority.
B. Vietnam was ruled entirely by China, while Japan controlled its
own government despite Chinese occupation.
C. Vietnam successfully resisted Chinese attempts at occupation,
while Japan was never engaged in direct conflict with China.
D. Vietnam was infrequently required to give China tributes, while
Japan was required to give tributes to China more regularly.
the answser is C