Tribal communities in Bihar are primarily concentrated in:

The northern plains
The southern Chota Nagpur plateau region
Urban centers
Along the major rivers

The correct answer is: b) The southern Chota Nagpur plateau region.

The Chota Nagpur plateau is a large plateau in eastern India, covering parts of the states of Jharkhand, Chhattisgarh, Odisha, and Bihar. It is a region of high biodiversity, with a wide variety of plant and animal life. The plateau is also home to a number of tribal communities, who have lived in the region for centuries.

The tribal communities of the Chota Nagpur plateau are known for their unique culture and traditions. They are often referred to as the “Adivasis” or “original inhabitants” of India. The tribal people of the Chota Nagpur plateau have a rich history and culture, which is passed down from generation to generation through oral tradition.

The tribal communities of the Chota Nagpur plateau are facing a number of challenges, including poverty, illiteracy, and lack of access to basic services. However, they are also a resilient people, who are determined to preserve their culture and way of life.

The other options are incorrect because:

  • Option a) is incorrect because the northern plains are home to a number of different ethnic groups, including the Bhojpuri, Maithili, and Magahi peoples.
  • Option c) is incorrect because the tribal communities of Bihar are primarily concentrated in rural areas, not urban centers.
  • Option d) is incorrect because the tribal communities of Bihar are not primarily concentrated along the major rivers.