Question

the korean war began in 1950 when the
soviet union attacked south korea
united nations invaded north korea
communist north attacked the non-communist south.
people of korea rose up against the japanese

Explanation:

The Korean War originated when the communist-aligned North Korea launched a military invasion of the non-communist South Korea in June 1950. The other options are incorrect: the Soviet Union did not directly attack South Korea, the United Nations forces intervened later to support South Korea, and the Korean resistance against Japan occurred before 1950, ending with Japan's WWII surrender.

Answer:

Communist North attacked the non-Communist South.