The Rajgir Hills, famous for their hot springs and historical significance, are geologically classified as which of the following?

Options:

• A: Highly eroded synclinal ridges composed of Dharwar quartzites and phyllites.
• B: Volcanic cones formed during the Deccan trap volcanism.
• C: Fault-block mountains formed during the Tertiary Himalayan orogeny.
• D: Karst topography developed in Vindhyan limestones.

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