Individuals Always Feel Loyalty Toward Their In-Group, but Under What

Multiple Choice

Individuals always feel loyalty toward their in-group, but under what circumstances would this loyalty be particularly strong?

A) when the in-group is particularly large
B) when the individual has belonged to the in-group for a short time
C) when the out-group is from a different city than the in-group
D) when the differences between the in-group and the out-group are sharply defined