Here are the descriptions matched to the correct countries following World War II:
China
B. Communists led by Mao Zedong took control following a civil war and established one-party authoritarian rule.
Japan
D. The United States helped establish a democratic government focused on economic growth here.
Korea
C. Communist and anti-communist forces backed by foreign nations went to war here, dividing the country into North and South.
Taiwan
A. Nationalists fled their homeland to establish a dictatorship with an economy here.