Explanation:

- The statement "The social life is characterised by Mutual adjustment and peaceful cooperation rather than mutual hostility and destruction" reflects a structural functionalist perspective.

- ?? Option 4: Parsons is correct. Talcott Parsons emphasized that social order is maintained through cooperation and mutual adjustment.

- Merton (Option 1) built on Parsons but was more focused on functions and dysfunctions within society.

- Karl Marx (Option 2) focused on class conflict, mutual hostility, and struggles for power.

- Max Weber (Option 3) emphasized meaning in social action and authority but didn’t explicitly frame society as characterized primarily by peaceful cooperation.