Explanation:

- The statement "The boundary between different social groups is breaking" is key to understanding social change.

- Conflict Perspective (Option 1): Focuses on power inequalities and struggles between different groups. This perspective might emphasize social boundaries.

- ? Post Modernist Perspective (Option 2): This perspective suggests that traditional boundaries and categories are dissolving. It fits the statement as it discusses the fragmentation and fluidity in society.

- Interactionist Perspective (Option 3): Studies small-scale social interactions and doesn't explicitly talk about large boundary shifts.

- Structuralist Perspective (Option 4): Emphasizes overarching structures. It might highlight the stability of social boundaries rather than their dissolution.