Which is the right set of ANTONYMS from the options for ‘Confidential’?

The correct option is Familiar, Revealed.

Explanation:
The word 'Confidential' refers to information or matters that are intended to be kept secret, private, or hidden from public knowledge.

An antonym is a word opposite in meaning to another word.

Let's evaluate the terms in 'Familiar, Revealed':
1. Familiar: Refers to something that is well-known, widely recognized, or easily understood, which is opposite to private or confidential information.
2. Revealed: Refers to something that has been made known, disclosed, or uncovered, directly opposing the idea of keeping something secret or confidential.

Evaluation of other options:
• Offstage, Sneaking: Both words relate to hidden, secret, or stealthy actions (synonyms/associated words).
• Public, Concealed: 'Public' is an antonym, but 'Concealed' is a synonym of confidential.
• Hushed, Common: 'Hushed' is a synonym (secret/quiet), while 'Common' is an antonym.

Thus, the set that consists entirely of antonyms for 'Confidential' is Familiar, Revealed.