How was the conflict in cambodia an example of proxy war

answer; /// (c) i believe that the correct answer is; ///full faith and credit.

(202 bc - 220 ad) dynasty started by lui bang; a great and long-lasting rule, it discarded the harsh policies of the qin dynasty and adopted confucian principles; han rulers chose officials who passed the civil service exams rather than birth; it was a time of prosperity

hey i did something like that before, what is the quesiton?