The meaning of the Idiom 'Make a clean breast of' is to:

Correct option is C

Option (c) is the correct meaning of the given idiom.
Given Idiom: Make a clean breast of : It means to confess fully, revealing the whole truth without hiding anything; to admit one’s mistake/culpability openly. Hindi: पूरी सच्चाई कबूल करना / साफ़-साफ़ स्वीकार करना.
Example: After hours of questioning, the player made a clean breast of his role in the foul play.
Other related idioms and their meanings:
· Come clean — to tell the truth frankly (साफ़-साफ़ सच बताना).
· Spill the beans — to reveal a secret (राज़ खोल देना).
· Eat humble pie — to admit one’s mistake and apologize (गलती मानकर माफ़ी माँगना).