Which nation appears to have restarted the operation of its main nuclear reactor?

A. Iraq

B. North Korea

C. South Korea

D. Ukraine

Explanation:

North Korea appears to have restarted the operation of its main nuclear reactor in Yongbyon, according to International Atomic Energy Agency (IAEA). The UN atomic agency said that it is “deeply troubled” by the indications, as the 5-megawatt reactor is widely believed to produce plutonium for nuclear weapons and is at the heart of North Korea’s nuclear programme.