Final answer:
The mural likely illustrates the demographic shift in Northern Ireland, where for the first time, Catholics now outnumber Protestants according to the 2021 census, indicating significant cultural and potential political changes in the region.
Step-by-step explanation:
The student's question about what the mural on the bottom of page 15 best illustrates seems to be related to the cultural and religious dynamics of Northern Ireland. Given the options provided and the context around Northern Ireland's cultural problems, the statement that the mural best illustrates is "The 2021 census showed that Catholics now outnumber Protestants for the first time."
This statement highlights a significant demographic shift in the region which has been historically divided along religious lines, with Protestants, mostly of Scottish and English descent, and Catholics, primarily of Irish heritage. With Catholics now outnumbering Protestants, there could be implications for the region's political affiliations and social dynamics.
Northern Ireland's history of conflict between these communities, associated with different cultural identities and political goals, is well-documented. The region's complex relationship with the Republic of Ireland and the United Kingdom largely revolves around these cultural and religious distinctions. This demographic change could influence future political decisions and the cultural landscape of Northern Ireland.