The most densely populated region of india in ancient times, as well as in modern times, is . a. along the river valleys in the north of india . b. on the deccan plateau . c. along the coastal plains of southern india . d. in the mountains valleys in the north of india

I think the correct answer among the choices listed above is option A. The most densely populated region of India in ancient times, as well as in modern times, is along the river valleys in the north of India. This is because people mostly rely on the resources in these areas.

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