Correct Option
The correct option is Digboi.
Explanation
Urban settlements are often classified functionally based on their dominant economic activity. Mining towns are those that have developed primarily due to the presence and extraction of mineral resources such as coal, oil, or iron ore.
Option Analysis
- Raniganj: Located in the Paschim Bardhaman district of West Bengal, Raniganj is famous for its coalfields. Geographically, West Bengal is part of Eastern India, not North-Eastern India.
- Jharia: Situated in Jharkhand, Jharia is renowned for its rich coal reserves. It is located in the Eastern part of India.
- Digboi: Located in the Tinsukia district of Assam, Digboi is known as the "Oil City of Assam" and is the site of Asia's first oil well. Assam is a core state of the North-Eastern region of India.
- Singrauli: Located on the border of Madhya Pradesh and Uttar Pradesh, Singrauli is a major energy hub. It is situated in Central India.
Key Takeaway: Digboi is a historic mining town associated with petroleum extraction and is the only option located geographically within the North-Eastern states of India.