Which of the Following Statements About the Chinese Tribute System

Which of the following statements about the Chinese tribute system is true?

A) The tribute system operated at the end of wars of conquest and was designed to humiliate the conquered people.
B) China's neighbors in the premodern period often refused to submit to the rituals of the tribute system because they resented China's assumption of superiority.
C) The tribute system was an exploitative one-way street,with foreign states paying tribute to China but the Chinese government offering nothing in return.
D) The Chinese government often gave other states gifts that were in fact worth more than the tribute that those states paid to China.