Correct Answer:
B. 2500 BC
The correct answer is B: 2500 BC. The Indus Valley Civilization, also widely known as the Harappan Civilization, represents one of the world's earliest and most significant urban civilizations. It primarily flourished in the basins of the Indus River, encompassing vast areas of modern-day Pakistan, Afghanistan, and India. Its mature phase, characterized by sophisticated urban planning, advanced drainage systems, and extensive trade networks, is generally dated from approximately 2500 BCE to 1900 BCE. During this period, prominent cities such as Mohenjo-Daro and Harappa reached their peak, showcasing remarkable architectural and societal development that predated many other major ancient civilizations in terms of urban complexity.
- A: 1500 BC is incorrect. By 1500 BC, the Indus Valley Civilization was largely in decline or had collapsed, and the Vedic period was beginning to emerge in the Indian subcontinent.
- C: 1000 BC is incorrect. This period is much too late for the flourishing of the Indus Valley Civilization, falling well into the post-Indus period, during which the Iron Age was beginning to establish itself.
- D: 500 BC is incorrect. 500 BC is considerably later, corresponding to the rise of major empires and the early classical period in South Asian history, long after the Indus Valley Civilization's existence.