In the following question, an idiomatic expression or a proverb is highlighted. Select the alternative which best describes its use in the sentence.
I've been so sleep deprived lately that it feels like I've lost my marbles!
Correct option - 2
If you say that someone has $lost their $marbles, you mean that their ideas or behaviour are very strange, as if they have become insane. $
The meaning of 'insane' :- A person who is in a state of mind which prevents normal perception, behaviour, or social interaction; seriously mentally ill.$
Thus, option 2 is the correct answer.$