The correct answer here is between the Protestants and the Northern Catholics.
Ireland has faced many struggles over the course of its history but one of the most enduring conflicts in the Northern Ireland especially is between the Protestants and Northern Catholics. Most of the Irish are traditionally Catholics but many Protestant's forefathers came to Northern Ireland from England and Scotland. Because of that there exists a conflict between the two different religious while also cultural backgrounds.
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A and B are the best answers, I'm 99% sure. Good luck, lovely! <3
