The korean war officially began in 1950 when a. south korea arrested and imprisoned thousands of communists. b. north korea crossed the 38th parallel and invaded south korea. c. south korea held free elections but north korea did not. d. north korea sought the support of china and the soviet union

The correct option is (b). The Korean War officially began in 1950 when North Korea crossed the 38th parallel and invaded South Korea.

Further Explanation:

Korean War:

After the cold war, Korea the  into two parts: North Korea which was supported by China and the Soviet Union and South Korea which was supported by America. The USA and the Soviet Union collectively formed a border to differentiate North Korea and South Korea. North Korea formed a communist party which was led by Kim-II-sung. South Korea formed an anti-communist party which was led by Syngman Rhee.

On 25 communist North Korea crossed the 38th parallel and started a war against South Korea. North Korea was backed up by a newly established communist state, China and Soviet Union. Soth Korea got assistance from the United Nations.  

Thus, the Korean war started when North Korea invaded South Korea by crossing the 38th parallel.  

Learn more:

1.Learn more about the cold war

2.Learn more about the downfall of china’s republic

3    Learn more about the civil war in the USA

Answer details:  

Grade: Middle School

Subject: History

Chapter: Cold War

Keywords: Korean War, officially, began, 1950, South Korea, arrested, imprisoned, thousands, communists, North, Korea crossed, 38th parallel, invaded, South Korea, South Korea, held, free, elections, North Korea, support, China, Soviet Union.

b.North Korea crossed the 38th parallel and invaded South Korea.

In an attempt to unify the separated Korean peninsula, North Korea invaded South Korea. The goal of the North Korean government was to unite the country and hold elections as they were promised. The United Nations came to defend South Korea and the 38th parallel division set by the UN following World War II. After a stalemate occurred between both sides, an armistice was agree to and the division of Korea was reestablished.

a

explanation:

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the exclusive possession or control of the supply or trade in a commodity or service.