Select the most appropriate option for blank (2).
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. in.
"In" is a preposition used to indicate inclusion within a time or space. Here, it is used to indicate the time period i.e. 2022 when the Earth's atmosphere rose to record levels.
Other options mean:
- of refers to belongingness.
- at is used to indicate presence or occurrence.
- on is used to show that something is in a position above something else.