The figurative speech in the given example-: It was an open secret that he was in love with her is Oxymoron. Thus option (C) is correct.
What is Oxymoron?
Oxymoron is the kind of the figurative speech which makes the use of the incompatible phrases together. For Example:- Unfaithful faith kept him acting dishonestly.
The figurative speech i.e. is Oxymoron is used in the given example. Therefore, The option (C) is correct.
Learn more about Oxymoron here:
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