Explanation:

- The statement “An association is an organization deliberately formed for the collective pursuits of some interest or set of interests” best matches the definition given by MacIver.

- Option 1: MacIver

- He is well-known for his work in sociology especially regarding associations and society.

- He defined associations as deliberately formed groups focusing on collective interests.

- Option 2: Kingsley Davis

- Davis focused more on population studies and social institutions, not mainly on associations.

- Option 3: Talcott Parsons

- Parsons was famous for his social systems theory, not specifically for this association definition.

- Option 4: Bierstedt

- Bierstedt is recognized for general sociological concepts but not for this particular statement.

Correct Answer:

Option 1: MacIver