The correct answer is: Manganese is found in the districts of Rohtas, Kaimur, and Gaya in Bihar.
Manganese is a chemical element with the symbol Mn and atomic number 25. It is a metal that is found in nature and is used in a variety of products, including batteries, steel, and fertilizer. Manganese is found in the earth’s crust and is also found in seawater. It is a relatively common element, but it is not always easy to extract.
The districts of Rohtas, Kaimur, and Gaya in Bihar are all known for their manganese deposits. The manganese in these districts is found in the form of ore, which is a mineral that contains manganese. The ore is mined and then processed to extract the manganese.
Manganese is an important mineral that is used in a variety of products. The manganese that is found in the districts of Rohtas, Kaimur, and Gaya in Bihar is an important resource for the state of Bihar and for India.
Option A: Patna and Gaya are both districts in Bihar, but they are not known for their manganese deposits.
Option B: Rohtas is a district in Bihar that is known for its manganese deposits.
Option C: Darbhanga is a district in Bihar that is not known for its manganese deposits.
Option D: Kaimur is a district in Bihar that is known for its manganese deposits.