The idiom "devil's advocate" means someone who pretends, in an argument or discussion, to be against an idea or plan that a lot of people support in order to make people discuss and consider it in more detail. It's not about literally defending something morally wrong or criminal, but rather about challenging ideas constructively.
I: Correct Usage - Tanya is challenging the proposal despite agreeing with it, which fits the idiom perfectly.
II: Incorrect Usage - The lawyer is defending a client in a legal context but not for the sake of argument or critical thinking. This is a misunderstanding of the idiom.
III: Correct Usage - Raj is provoking deeper responses by taking an opposing view, which is a textbook example of playing devil's advocate.
Therefore, option (a) is correct.
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