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Which outcome occurs from decreased fluvial sediment discharge towards a coastal barrier island system?

A)Island submergence increases storm vulnerability
B)Mangrove forest area substantially expands
C)Brackish lagoon salinity sharply decreases
D)Salt marsh accretion rate keeps pace

💡 Explanation

Decreased sediment supply prevents barrier island maintenance via overwash; the mechanism is sediment budget reduction. This causes island lowering and landward retreat because the island cannot replenish itself, therefore submergence susceptibility increases, rather than maintaining its elevation.

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