Step 1: Understanding the Concept:
The question requires matching key anthropological/sociological studies or concepts related to Indian social groups with their authors.
Step 2: Detailed Explanation:
- A. Kamars of Madhya Pradesh: S.C. Dube authored "The Kamar" (1951), a detailed ethnographic study of this tribe. Therefore, A corresponds to III.
- B. Khallu - Maler - Gosain: This relates to L.P. Vidyarthi's ethnographic work on the Maler tribe of Jharkhand's Rajmahal hills. His study developed the "Nature-Man-Spirit Complex" concept. Khallu and Gosain are references from his fieldwork. Thus, B corresponds to IV.
- C. Jati influence by tribes of Orissa: N.K. Bose, notably in his paper "The Hindu Method of Tribal Absorption," extensively analyzed the integration of tribal groups in Orissa into the Hindu caste (Jati) system. Hence, C corresponds to II.
- D. Thakur landlords - Brahmin cook: This illustrates Sanskritization, where a lower or middle-ranking group (e.g., Thakur landlords) adopts the practices of a higher group (e.g., Brahmins, symbolized by hiring a Brahmin cook) to elevate their social status. M.N. Srinivas famously developed this concept. Consequently, D corresponds to I.
Step 3: Final Answer:
The correct matches are A-III, B-IV, C-II, D-I, aligning with option (B).