If a factory is built near a forest and starts releasing thick black smoke, why might the local bird population decrease even if the birds aren't breathing the smoke directly?

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• A The smoke makes the birds' feathers too heavy to fly.
• B The pollution kills the insects and plants the birds need for food.
• C The birds prefer to live in cities with more smoke.
• D The smoke turns the trees into a color the birds don't like.

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