题目解析:
题干提问“中国统治者在什么时候对铜器和玉器的支出更多”。
定位第7段第2句 when they wished to distract attention from weaknesses in society, they emphasized their power even more by increasing expenditure on ritual objects.(当他们希望转移人们对社会弱点的关注度时,他们会通过增加对仪式物品的支出来更加强调自己的权力),对应选项 C 表述。
故选 C。