Step 1: Understanding the Concept:
This question requires matching significant anthropological/sociological studies or concepts related to Indian social groups with their respective authors.
Step 2: Detailed Explanation:
- A. Kamars of Madhya Pradesh: The classic ethnographic monograph "The Kamar" (1951), detailing the life of this tribe, was written by S.C. Dube. So, A matches with III.
- B. Khallu - Maler - Gosain: This refers to the ethnographic work on the Maler tribe of the Rajmahal hills in Jharkhand. The concept of the "Nature-Man-Spirit Complex" was developed through this study by L.P. Vidyarthi. Khallu and Gosain would be references from his fieldwork. So, B matches with IV.
- C. Jati influence by tribes of Orissa: N.K. Bose, in his influential work, particularly his paper "The Hindu Method of Tribal Absorption," extensively discussed how tribal groups in Orissa were integrated into the Hindu caste (Jati) society. So, C matches with II.
- D. Thakur landlords - Brahmin cook: This phrase encapsulates the process of Sanskritization, where a lower or middle-ranking group (like Thakur landlords in a village context) adopts the rituals and practices of a higher group (like Brahmins, signified by employing a Brahmin cook) to improve their own social status. This concept was famously developed by M.N. Srinivas. So, D matches with I.
Step 3: Final Answer:
The correct pairings are A-III, B-IV, C-II, D-I. This corresponds to option (B).