Final answer:
The Rhine River empties into the North Sea.
Step-by-step explanation:
The correct answer is C. Rhine.
The Rhine River empties into the North Sea. It is one of the major rivers in Europe, flowing through several countries including Switzerland, Germany, and the Netherlands.
The other options, Po, Tagus, and Danube, do not empty into the North Sea. The Po River is in Italy, the Tagus River is in Spain and Portugal, and the Danube River flows through several Eastern European countries and empties into the Black Sea.
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