The correct answer is D) Both Korea and Vietnam were divided into conflicting communist and non-communist territories.
The other options of the question were A) Both Korea and Vietnam were drawn into the war when the United States attempted to stop China's imperialist growth. B) Both Korea and Vietnam were allies of the Soviet Union that were seeking nuclear weapons technology. C) Both Korea and Vietnam were under the control of European empires that refused to grant them independence.
The statement that describes a similarity between the Korean War and the Vietnam War is "Both Korea and Vietnam were divided into conflicting communist and non-communist territories."
The similarity stems from the situation that the world lived in those years of the Cold War. The Soviet Union backed North Korea and North Vietnam because it wanted to spread Communism in those places. On the other hand, the United States applied the policy of contention because it wanted to stop Communism because the US thought that it represented a threat to its political and economic interests in the world.