What Has Been an Important Source of Conflict in Northern

What has been an important source of conflict in Northern Ireland?

A) The Protestant majority feel that the Catholic minority has discriminated against them.
B) The Catholic minority feel that the Protestant majority has discriminated against them.
C) The Protestant majority resents affirmative action programs for the Catholic minority.
D) The Protestant majority has been denying religious freedom to the Catholic minority.
E) All of the choices are correct.