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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