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The correct answer is option 4: Caspian sea and Mediterranean sea. The BTC oil pipeline, also known as the Baku-Tbilisi-Ceyhan pipeline, is a major oil transportation route that spans over 1700 km. It connects the Caspian Sea, located in Central Asia, to the Mediterranean Sea, which is located in Southern Europe.
Option 1, Arabian Sea and Mediterranean Sea, is incorrect. The Arabian Sea is located in the northern Indian Ocean and is not connected to the BTC pipeline.
Option 2, Aral Sea and Caspian Sea, is incorrect. The Aral Sea, once one of the world`s largest lakes, is located in Central Asia. While it is in close proximity to the Caspian Sea, it is not directly connected by the BTC pipeline.
Option 3, Black Sea and Mediterranean Sea, is incorrect. The Black Sea is a body of water located between Southeastern Europe and Western Asia. It is not directly connected to the BTC pipeline.
In summary, the BTC pipeline connects the Caspian Sea and the Mediterranean Sea, making option 4 the correct answer.