The correct answer to this open question is B) Persian.
The other options of the question were A) Peloponnesian. C) Scythian. D) Grecian.
The defining moment in Greek history is the Persian Wars.
We are talking about the bloody war between the First Persian Empire and the many Greek city-states or simply, Greece. This was one of the most important moments in ancient Greece. The conflict started in 499 BC when Cyrus the Great captured the region of Ionia. The war ended in 449 with a victory for the Greek army, which could overcome many adversities due to the joined forces of the Athenian Army with the well-trained warriors of Sparta.