The concept of the 'alluvial frontier' in the context of Magadha's rise refers to:

Options:

• A: The shifting of the course of the Ganges river which naturally destroyed rival capitals.
• B: The strategic use of river floods as a defensive mechanism against foreign invaders.
• C: The migration of Vedic people from the dry Punjab region to the wet plains of Bengal.
• D: The expansion of agricultural settlements into the dense, marshy monsoon forests of Bihar using iron technology.

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