Plains are called the ‘Cradle of Civilization’ because their fertile alluvial soil and proximity to perennial rivers allowed early humans to transition from hunting to settled agriculture. This surplus food production enabled the growth of cities, trade and organized government, as seen in the Indus Valley, Mesopotamian and Nile civilizations. ANSWER: (C) Because fertile soil and water availability supported early agricultural societies.
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Human history is deeply tied to the geography of plains. The flat terrain of river valleys made them ideal for large-scale irrigation and farming. Because food could be grown reliably and in surplus, people could settle in one place, leading to a division of labor and the birth of complex cultures. Plains also facilitated easy transportation and communication, which are essential for the expansion of empires and trade networks. From the Huang He in China to the Ganges in India, plains have provided the environmental stability and resources required for the most significant advancements in human society.