Answer:
Option: C. Two groups were fighting over different beliefs.
Step-by-step explanation:
The reason for the Trouble in Ireland from the late 1960s until 1998 was because of the religion. Ireland was the follower of the Catholic which differed from the Protestant. Ireland being catholic did not want to stay under the British Crown who followed Protestantism. Protestants in Northern Ireland were a supporter of the British who enjoyed privileges and controlled the country despite being having less population than the Catholic.