Emile Durkheim is famous for his study on:

Suicide

The correct answer is Option (1) → Suicide

Durkheim's seminal work, "Le Suicide" (1897), is a comprehensive sociological study that examines the social factors influencing suicide rates.  Durkheim argued that the rate of suicide (i.e., number of suicides per 100,000 population) had to be explained by social causes even though each particular instance of suicide may have involved reasons specific to that individual or her/his circumstances