Select the most appropriate meaning of the given idiom.
Lose your marbles

Correct option is C

Option (c) is the correct meaning of the given idiom.
Given Idiom: Lose your marbles – to become mentally unstable or go crazy. (पागल हो जाना या मानसिक संतुलन खो देना)
Example: He started talking to himself—people thought he had lost his marbles.
Other related idioms and their meanings:
Go off the rails – to behave in an uncontrolled or abnormal way.
Lose one's head – to panic or go irrational.
Out of one's mind – mentally unstable.