Explanation
Why Correct: Indus Valley Civilization featured planned cities with grid layouts, drainage systems, public baths, and multi-story houses, representing India's first urban culture around 2600-1900 BCE.
Distractor Analysis: Rural describes village-based agrarian societies without urban planning. Stone Age refers to prehistoric periods using stone tools before metalworking. Iron Age denotes later periods when iron tools became widespread, post-dating the Indus civilization.
Takeaway: Harappa and Mohenjo-daro were the largest Indus cities, with standardized bricks, granaries, and citadels indicating centralized administration.