The correct answer is: B. Parallel to the India – Nepal boundary.
The Tarai region is a belt of low-lying, swampy land along the southern border of Nepal. It is a transitional zone between the Himalayas and the Ganges Plain. The Tarai is a major agricultural region, and is also home to a number of important wildlife habitats.
The Tarai region is a relatively recent geological formation. It was created by the deposition of sediments from the Ganges River over millions of years. The Tarai is also affected by the annual monsoon rains, which cause the rivers to flood and deposit more sediment.
The Tarai region is a very important part of the Indian subcontinent. It is a major agricultural region, and is also home to a number of important wildlife habitats. The Tarai is also a popular tourist destination.
Here is a brief explanation of each option:
- Option A: Parallel to the north bank of Chotanagpur plateau. This is incorrect because the Tarai region is located south of the Chotanagpur plateau.
- Option B: Parallel to the India – Nepal boundary. This is the correct answer because the Tarai region is located along the southern border of Nepal.
- Option C: Parallel to the east bank of Rohtas plateau. This is incorrect because the Tarai region is located west of the Rohtas plateau.
- Option D: Parallel to the west boundary of Rajmahal mountain series. This is incorrect because the Tarai region is located east of the Rajmahal mountain series.