Did the governments of China, Mongolia, or Taiwan change after the 1980s? If so, which changed, and how? *a. Mongolia and China both set up a second political party.

b. China’s Communist Party allowed new political parties after the Tiananmen Square protests.
c. Mongolia and Taiwan allowed new political parties to take part in elections.
d. The governments of China, Mongolia, and Taiwan did not change after the 1980s

I dont know can someone help me?