The drying up of the Ghaggar-Hakra river system, often identified with the Vedic Saraswati, is considered a major factor in the decline of the Harappan civilization. Which of the following hydro-geological events is primarily believed to have caused this diversion and subsequent drying?

Options:

• A: A sudden subsidence of the entire Thar Desert region, causing the river to flow underground into the Arabian Sea.
• B: A massive volcanic eruption in the Deccan Traps that altered the monsoon patterns across the Indo-Gangetic plains.
• C: The construction of extensive canal networks by the Late Harappans which over-exploited the river's headwaters.
• D: The diversion of the Yamuna into the Ganga system and the Sutlej into the Indus system due to tectonic movements in the sub-Himalayan region.

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