![16 sep quiz](https://www.gkseries.com/blog/wp-content/uploads/2021/09/Copy-of-Online-Quiz-Made-with-PosterMyWall-6.jpg)
A) Keep Cool and Carry on: The Montreal Protocol
B) Ozone for life: 35 years of ozone layer protection
C) Montreal Protocol – keeping us, our food and vaccines cool
D) 32 years and Healing
Explanation: Theme for 2021 World Ozone Day: ‘Montreal Protocol – keeping us, our food and vaccines cool.’