Select the most appropriate option that can substitute the underlined segment in the given sentence.
Brian remained silent during the board meeting, though Rahul was unaware that he had an ace up his sheath the entire time.
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. an ace up his sleeve.
The phrase "an ace up his sleeve" is a common idiom, meaning to have a secret advantage or plan that others are unaware of. It fits the context of the sentence well.
The other options do not fit the context of the sentence well.