The correct options are
B Decades of oppression
C Caste hierarchies
D Social exclusion
Robert Merton and Robert Nisbet define social problems as “a way of behaviour that is regarded by a substantial part of society as being in violation of one or more generally accepted or approved norms". Oppression, caste hierarchies, and social exclusion are some of the social problems in today's society. They affect people of all ages - right from children to aged people. Cyber-bullying is also a social problem.