The correct answer is: C. Ranidih hill
The Ranidih hill is a watershed between the Kiul and Man rivers in Bihar. It is located in the West Champaran district of Bihar. The hill is about 100 km long and 50 km wide. The highest point on the hill is about 1,000 meters above sea level. The hill is made up of sandstone and shale. The climate on the hill is temperate. The hill is covered in forests. The forests are home to a variety of animals, including tigers, leopards, elephants, and deer. The hill is also home to a variety of birds, including peacocks, parrots, and hornbills. The hill is a popular tourist destination. The hill is also a popular destination for trekking and mountaineering.
The other options are incorrect because they are not located in Bihar or they do not form a watershed between the Kiul and Man rivers.
- Option A: Pretshila hill is located in Jharkhand.
- Option B: Kharagpur hill is located in West Bengal.
- Option D: Maher hill is located in Uttar Pradesh.