Keeping the frequency of nuclear tests, it is estimated that on an average the five nuclear powers conducted nuclear tests at the rate of:
Correct answer: D. One test every 9th day
- A. One test every 20th day
- B. One test every 13th day
- C. One test every 11th day
- D. One test every 9th day
Explanation
The combined testing history of the five recognized nuclear powers gives an average close to one test every nine days. This is a historical environmental-pollution statistic rather than a measure of present testing frequency.
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