Correct option is A
The correct option to fill in the blank is
(a) concern.
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Explanation: "Concern" fits the context as it refers to a matter that causes worry or distress, which aligns with the air pollution affecting local residents. (Hindi: चिंता का कारण)
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Example: Rising pollution levels are a growing concern for authorities.
Why Other Options Are Incorrect:
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Idea: Refers to a concept or thought (Hindi: विचार).
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Law: Refers to a set of rules (Hindi: कानून).
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Area: Refers to a region or space (Hindi: क्षेत्र).