The correct answer to this question is A) It was the invasion and occupation of North Korea by the Soviet Union during World War II.
What led North Korea to become a Communist country was the invasion and occupation of North Korea by the Soviet Union during World War II.
At the end of World War II, the USSR and the United States divided the Korean territory into two zones. It was called the 38th parallel division, in which the Soviet Union kept the north part of the territory and the United States the south. That was the beginning of North Kore, supported by the Russians and of South Korea, supported by the United States.
The other options of the question were B) it was the influence of the Chinese nationalists that invaded territory during the Boxer Rebellion. C) the Korean Revolution's overthrow of the Republic of Korea. D) the Puppet government of Puyi establishing a Communist state on the Korean Peninsula.
