A drowned river valley estuary is formed when ?

[A] a barrier island or sand bar separates a section of the coast where fresh water enters.

[B] sea level rose at the end of the last glacial age invading low lands and rivers.

[C] a deep valley is created by retreating glaciers.

[D] land sinks due to movements of the crust.

Answer & Explanation
Answer: sea level rose at the end of the last glacial age invading low lands and rivers.

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