The answer is letter A. Because of the belief of the Chinese of the Mandate of
Heaven, their emperor was not able to boost their economic as well as the
continuous problems in government. The Tang Dynasty decided to merge with
Emperor Gaozu to improve the economic and political sectors during the Tang
dynasty
The mandate is important because its about who can rule and who can get kicked out and so when the made corrupted everything fell including their lifestyle.
The best option would be that "<span>D. The United States, with help from the United Nations, forced Saddam Hussein to step down as the leader of Iraq," although it was much more of a unilateral effort by the US.</span>