Explanation:

- Robert Redfield - An American anthropologist known for his work on the city-village dichotomy and the study of cultural change.

- B.S. Guha - An Indian anthropologist focused on physical anthropology and the classification of Indian ethnic groups.

- Richard Lannoy - Authored works on Indian society and culture, including analyses of its structure and organization.

- "Totemic social organization was never completely abandoned by a very large number of castes in the vast central belt" is indeed a line from Richard Lannoy's writing.

- S.S. Sakar - Less information available, possibly a scholar with contributions to social anthropology.