What idea did confucius introduce to social relationships in ancient china?

the idea of filial piety, that children should respect and honor their parents and ancestors
the idea of yin and yang, that there are two totally opposite forces at work in social relations
the idea of ancestral descent, that firstborn male children are the most important family members
the idea of the mandate of heaven, that the gods would allow kings to be overthrown if they were corrupt

The idea of filial piety, that children should respect and honor their parents and ancestors, is the correct option.

Explanation:

The concept of filial piety was described by Confucius in his book Xiao Jing in 4th century BCE. Its been part of Chinese culture and values since then. It means having the attitude of respect, love, and support for parents and elders of the family,  It also includes obeying their wishes and taking care of them when they are old. The basis of these ideas is from the fact that since parents provide food, love shelter and education to their children, hence they are forever indebted to them. So, to acknowledge this debt they should serve them.

a drastic rise in oil prices ended decades of postwar.

it was on the rise and doing very well and would continue to do well until the great depression from 1929-1939