Why was the annexation of Anga by Bimbisara considered a turning point in the geopolitical history of Magadha?

Options:

• A: It eliminated the threat of the western Mahajanapadas and allowed Magadha to focus entirely on the southern peninsula.
• B: It gave Magadha control over the riverine trade of the Ganges and access to the sea routes via the port of Champa, laying the economic foundation for empire-building.
• C: It led to the immediate submission of the Avanti kingdom, which feared Magadha's newly acquired naval power.
• D: It marked the first time a republican state was successfully converted into a centralized monarchy in ancient India.

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