Explanation:

- Option:1 Social Facts: Durkheim used the concept of social facts to identify societal norms, values, and structures that exist outside individual choices, shaping behavior and phenomena broadly.

- Option:2 Religion: In his study of religion, Durkheim examined the role and function of religious beliefs and how they contribute to social cohesion, but did not use statistical methods as the primary approach.

- Option:3 Suicide: Durkheim's study of suicide was pioneering in using statistical techniques to connect social factors with individual acts, examining correlations between societal conditions and suicide rates.

- Option:4 Division of Labour: Durkheim analyzed the division of labor to explain changes in social cohesion and structure; however, statistical methods were less emphasized here.