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Answer

Correct Option is Trees are proven to block noise that is emitted in these places.

The correct choice for the answer is option (a): Trees are proven to block noise that is emitted in certain places.
The answer can be found in the last paragraph where it says “Trees can deflect sound, one reason you'll see them lining highways, along fences and between roads and neighbourhoods.”
Hence, we can conclude that option (a) is the appropriate choice for the answer.

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