A. September 14th
B. September 15th
C. September 16th
D. September 17th
Explanation:
World Ozone Day 2021, the International Day dedicated for the Preservation of the Ozone Layer is observed every year on September 16. The day is observed as a reminder of the Spring of 1975 when the scientists in Antarctica had detected an appalling drop in the Ozone concentration.
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