Respuesta :
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.
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.