Based on the widespread use of levees along the Mississippi River, the wetlands along the Louisiana coastline are shrinking. Thus, option "B" is correct.
The wetlands on the Louisiana coast are shrinking. The use of levees is part of the problem because the Mississippi river would naturally feed into the wetlands and enrich the wetlands with soil. Because of the levees and other causes of erosion and weathering, the wetlands along the coastline are now seeing a decline.
Thus, option "B" is correct.
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