From the given options, choose the correct meaning of the idiom given in bold in the sentence :

His promotion is on the cards.

certain

The correct answer is Option (3) → certain

The correct meaning of the idiom "on the cards" in the sentence "His promotion is on the cards" is: certain

The phrase "on the cards" means something is very likely to happen or is expected to occur in the future. Therefore, in this context, it indicates that his promotion is likely or expected to happen.