The Volga, Dnieper, Don, and Danube are all important rivers in Europe.

Option 1 - The Volga is the longest river in Europe and is located mainly in Russia. It does not drain into the Black Sea, instead, it empties into the Caspian Sea and is therefore the correct answer.

Option 2 - The Dnieper is one of the major rivers of Europe that rises in Russia and flows through Belarus and Ukraine, draining into the Black Sea.

Option 3 - The Don river is one of the major rivers in Russia. The Don drains into the Sea of Azov, which is linked to the Black Sea via the Strait of Kerch.

Option 4 - The Danube is the second longest river in Europe, after the Volga. It flows through 10 countries and drains into the Black Sea.

So, Option 1, the Volga, is correct because it does not drain into the Black Sea, instead, it drains into the Caspian Sea.