The fall of the Assyrian Empire was primarily caused by the invasion of Persian armies. Hence option C is correct .
The Assyrians had long been a dominant force in the ancient Near East, but their military might was weakened by years of constant warfare and their empire became too large to govern effectively. In 612 BCE, a coalition of Babylonians, Medes, and Scythians launched a successful attack on the Assyrian capital city of Nineveh, leading to the collapse of the empire.
While the cost of sustaining luxurious palaces and the creation of the Hanging Gardens of Babylon were significant factors in the decline of Assyrian power, they were not direct causes of the empire's downfall. The fall of the Ishtar gate, while a notable event, was not a decisive factor in the collapse of the Assyrian Empire.
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