According to Tajfel, the Development of a Generic Norm of Behaviour

According to Tajfel, the development of a generic norm of behaviour toward an out-group is the result of:

A) repeated exposure to in-group/out-group categorizations
B) having been discriminated against by the out-group
C) pre-existing hostility toward the out-group
D) an individual's perception of personal benefits from such norms
E) both b and c