The correct answer is option 3 - Family.

Formal agencies of social control are designated institutions that have the authority to enforce and regulate social norms and rules. They play a crucial role in maintaining order and discipline in society.

Courts, option-1, are formal agencies of social control as they are responsible for applying the law, making legal decisions, and resolving disputes. They help to ensure justice is served and enforce penalties for criminal behavior.

Police, option-2, are also formal agencies of social control as they are responsible for maintaining public order, preventing and investigating crime, and detaining those who violate the law.

Teachers, option-4, are also considered as formal agencies of social control as they play a role in shaping and enforcing rules within educational institutions. They maintain discipline, impart moral values, and promote proper behavior among students.

However, family, option-3, is not a formal agency of social control. While family members can influence and socialize individual behavior, they do not possess the legal authority to enforce laws or impose penalties. Family primarily functions as an informal agency of social control, providing guidance and teaching moral values to its members.