The Indo-Greek kingdom set up in north Afghanistan in the beginning of the second century BC was

The correct answer is Bactria. After the death of Alexander the Great and the subsequent decline of the Seleucid Empire, the Greek governors of Bactria, located in present day northern Afghanistan, declared independence around 250 BC. In the beginning of the second century BC, under leaders like Demetrius I, the Greco-Bactrians expanded their control into the Indian subcontinent, establishing the Indo-Greek kingdom. This region was known for its distinct blend of Greek and local cultures. Options like Scythia, Zedrasia, and Aria refers to different geographical areas or groups that do not fit the specific description of the primary Indo-Greek kingdom founded in northern Afghanistan during that period.