How is the river different from the sea

A sea is smaller than an ocean which may be partly or fully enclosed by land. A river is a naturally flowing body of water which comes from higher areas such as mountains. Seas are much bigger than rivers which are longer and narrower. Seas have salt water while rivers have fresh water.

A sea is smaller than an ocean which may be partly or fully enclosed by land. A river is a naturally flowing body of water which comes from higher areas such as mountains. Seas are much bigger than rivers which are longer and narrower. Seas have salt water while rivers have fresh water.

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i believe the answer is d

the correct answer is (a) . answer should be simple, clear and brief.