Select the most appropriate meaning of the highlighted idiom in the given sentence.
I accidentally let the cat out of the bag about your promotion.

Correct option is B

Option (b) is the correct meaning of the given idiom.
Let the cat out of the bag: To accidentally reveal a secret or confidential information that was meant to be kept hidden.
Example: She let the cat out of the bag about the surprise party.
Other related idioms and their meanings:
· Spill the beans – Reveal secret information
· Blow the cover – Expose someone’s identity or secret
· Drop a hint – Indirectly suggest something