In the following question, out of the given four alternatives, select the alternative which best expresses the meaning of the Idiom/Phrase.
Play your ace

Correct option is A

Option (a) is the correct meaning of the given idiom "Play your ace."
Meaning: To use your best resource or strategy.
Example: "When negotiations were going poorly, he played his ace by offering a significant discount."
Similar idioms: Pull out all the stops, put your best foot forward.