Which of the following is a contribution of ancient China? A. They used irrigation to make farming more productive.
B. They introduced terracing to make farming more productive.
C. They sold goods in the Mediterranean to expand trade.
D. They sold goods in the Mediterranean to expand trade.

i believe it would influence their own way of understanding things. it shall be a foundation where they can draw or start an argument.   historians are also  scientists that  have their tools of analysis and expertise to unlock a variety of difficulties such as relationships of man, origin, politics, economy, and culture. based on facts and understanding on these areas, they may shade light to extract ideas and develop options to validate a hypothesis or debunk it.

a. all people should come together to heal the nation.

the railroad administration