In 1951-53, A. Ghosh identified the Sothi culture in Rajasthan. What was his primary thesis regarding this culture's relationship with the Indus Valley Civilization?

Options:

• A: Sothi was a post-Harappan culture that migrated from Baluchistan after the drying up of the Sarasvati River.
• B: Sothi was an independent, non-Harappan chalcolithic culture that had no contact with the Indus plains.
• C: Sothi represented the formative, proto-Harappan substrate from which the Mature Harappan culture evolved.
• D: Sothi was a specialized administrative outpost established by Mohenjo-daro to control the copper mines of Khetri.

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