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Which consequence results when a barrier island's overwash threshold is exceeded?

A)Increased estuarine salinity intrusion occurs
B)Accelerated bluff retreat begins inland
C)Increased subduction zone volcanism starts
D)Eutrophication risk in nearshore ecosystems decreases

💡 Explanation

Increased estuarine salinity intrusion occurs because overwash transports seawater into normally freshwater areas; this process introduces excess NaCl via the mechanism of tidal forcing. Therefore, salinity increases, rather than decreased eutrophication, because nutrient deposition isn't necessarily reduced by the event.

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