Which of the following statements is geographically accurate regarding the 'Ramnagar Dun' in West Champaran?

Options:

• A: It is a continuous, high-altitude mountain range exceeding 1,000 meters in height.
• B: It is an active volcanic dome that marks the boundary between Bihar and Nepal.
• C: It is a vast swampy wetland formed by the backwaters of the Gandak River.
• D: It is a low, dissected hill range stretching south of the Harha river valley, with a maximum elevation of around 240 meters.

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