World ozone day is celebrated on
16 September
The correct option is B.
Explanation of the correct option:
Explanation of the incorrect options:
Option A:
Civil Services Day is celebrated on 21 April.
Option C:
World's Earth Day is celebrated on 22 April.
Option D:
World Environment Day is celebrated on 5 June.
Final answer: World ozone day is celebrated on 16 September.