The correct answer is option b. "high levels of radiation".
Explanation:
The most dramatic environmental consequence of the nuclear meltdown at Chernobyl was the high levels of radiation at the city and regions around it. It is reported that soon after the explosion people at Chernobyl were exposed to radiation levels of 8,000 to 16,000 millisievert (mSv), which has compared to receiving 80,000 to 160,000 chest X-rays. The environmental consequences of the nuclear meltdown at Chernobyl are practically permanent, which has lead the authorities to establish an Exclusion Zone of approximately 2,600 km2.
