In the legend of Videgha Madhava, what does the movement of 'Agni Vaisvanara' (the sacrificial fire) burning eastward from the Sarasvati river symbolize in historical-geographical terms?

Options:

• A: The military conquests of the Kuru-Panchala kings over the indigenous tribes of Bihar.
• B: A devastating volcanic eruption that cleared the forests of the Gandak region.
• C: The migration of early Vedic pastoralists fleeing from severe droughts in the Punjab region.
• D: The dual process of clearing dense forests through fire and the expansion of Brahmanical sacrificial culture.

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