The correct answer is: B. Indian history research.
The Bihar Research Society (BRS) is a learned society based in Patna, India. It was founded in 1915 by a group of scholars and educationists with the objective of promoting research in the history, culture, and languages of Bihar. The BRS has published a number of important works on Indian history, including the Patna University Journal, the Journal of the Bihar Research Society, and the Bihar District Gazetteers.
The BRS is also involved in the preservation of historical monuments and artifacts in Bihar. It has established a museum in Patna, which houses a collection of sculptures, coins, and other objects from the region. The BRS also organizes lectures, seminars, and conferences on Indian history and culture.
The other options are incorrect because:
- Sanskrit research is not the main focus of the Bihar Research Society.
- Archaeological research is not the main focus of the Bihar Research Society.
- Hindi literature research is not the main focus of the Bihar Research Society.