Option A: Wrote on the caste system in India
Both B.R. Ambedkar and E.V. Ramaswamy Naicker (Periyar) advocated and worked to establish a society free from caste inequalities and discrimination.
Source: Democratic Politics II, Chapter 3 (Caste and Politics)
The textbook explicitly mentions both B.R. Ambedkar and Periyar Ramaswamy Naicker together as leaders who "advocated and worked to establish a society in which caste inequalities are absent." The other options — women's experiences, cultural heritage, or national freedom — are not associated with both of them jointly in the passage.