Correct option is B
Option (b) is the correct meaning of the given idiom.
Idiom – Devil’s Advocate: A person who expresses a contentious opinion in order to provoke debate or test the strength of the opposing arguments. (वह व्यक्ति जो केवल बहस के लिए विरोधी पक्ष रखता है)
Example: She wasn’t against the plan but played devil’s advocate to test its weaknesses.
3 Other related idioms:
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Split hairs – To make fine or overly subtle distinctions.
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Beat around the bush – To avoid talking about the main point.
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Add fuel to the fire – To make a bad situation worse.