Select the most appropriate idiom to fill in the blank.
I was going to mention it, but it _____.

Correct option is D

Option (d) is the correct meaning of the given idiom.
Idiom: “Slipped my mind” – This idiom means to forget something unintentionally (भूल जाना / ध्यान से निकल जाना).
Example: I meant to wish her on her birthday, but it completely slipped my mind.
Other related idioms and their meanings:
· Brought to mind – Recalled or remembered something (याद आना)
· Changed my mind – Decided to do something different (फैसला बदलना)
· Bore in mind – Remembered or considered something (ध्यान में रखना)