The region on the map which shows Alexander's Empire at its greatest size is:
- The area from the Mediterranean, through the Black Sea, Caspian Sea and the surrounding territories
Alexander the Great was a great conqueror who was famous for his strategies in invading and taking over a territory and defeating them in battle, even when he was outnumbered.
As a result of this, we can see that there is a great and large empire which he seized control of which was from the Mediterranean Sea, the Caspian Sea and the territories around it was when it was its greatest size.
Therefore, the correct answer is option B
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