The correct answer is Option (4) → (A)-(III), (B)-(IV), (C)-(I), (D)-(II)
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(A) Rhine Waterway: The Rhine River flows through or borders several countries, but its mouth and a significant portion of its navigable section are in the (III) Netherlands, which is crucial for its access to the North Sea. It's a major European waterway.
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(B) Danube Waterway: The Danube River flows through ten countries in (IV) Eastern Europe (and Central Europe), making it a vital waterway for the region.
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(C) Volga Waterway: The Volga River is the longest river in Europe and is entirely within (I) Russia, serving as a major transportation artery.
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(D) St. Lawrence Seaway: This system of locks, canals, and channels connects the Great Lakes to the Atlantic Ocean, primarily serving (II) North America (specifically Canada and the USA).
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