The thing that will happen to mangroves if nearby a coral reefs are destroyed is that:
The destruction that is known to have taken place in mangrove forests in the area of the coastal wetlands is known to be one that is highly depleting the amount of natural tannins in the water.
Due to the above, this is known to have subjected the close by coral reefs to have what we call an undue UV radiation. Its effect is that the reefs are said to be sunburned a lot and then the coral bleaching takes place.
Therefore, The thing that will happen to mangroves if nearby a coral reefs are destroyed is that Option C: Reefs will receive less sunlight due to increased turbidity in the water.
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