Explanation:

- The idea that social structure is understood through roles, networks, and patterns is strongly linked to Radcliffe-Brown.

- Radcliffe-Brown (Option 2) was a pioneering British social anthropologist. He emphasized the analysis of social structure through the interrelations, roles, and social networks of individuals in a society. ??

- S.F. Nael (Option 1) is not a prominent name associated with this theoretical contribution.

- Herbert Spencer (Options 3 & 4) was a sociologist who compared society to a living organism but focused less on networks and specific roles.

- The correct answer is:

Option 2 – Radcliffe-Brown ??