Verified Answer :

Hagrid

The river that is considered as the world’s busiest waterway is the
river of Seine, letter D. it flows directly into the English Channel. It is a
350 mile long arm of the Atlantic Ocean situated between the south coast of the
United Kingdom and the north coast of France.

RASEA23

D. The Seine. It's a 777 km long commercial waterway near Paris. Its very crowded because of the cruises that go along the river and because of its location near Paris.

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