Correct option is 1) The tensions between North Korea and South Korea started over boundaries drawn during the Cold war.
Korean War
The prime reason for the Korean war was the territorial control over Korean region. Although the passage is all about proliferation of Nuclear Missiles by North Korea, the reason for this menace was the boundaries drawn during the Cold war.
Therefore, the best option is 1. The tensions between North Korea and South Korea was caused dueto the boundaries drawn during the Cold War.
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