The correct answer is B) China.
The country that experienced the growth of a Communist movement that challenged the ruling Nationalist government in the years after World War was China.
Mao Zedong was the leader of the Communist that defeated the troops of the Nationalist Party in the Chinese Civil War. So on October 1, 1949, Mao Zedong proclaimed the foundation of the PeopleĀ“s Republic of China. It was Mao who established Communism in China with the support of the Soviet Union. Mao was the generator of the Cultural Revolution and the Great Leao Foward.