Behavior of individuals and groups in a political environment is studied by political science. This field contributes to OB with the topics of power allocation, conflict resolution, individual interests and negotiation, so the correct answer is A.

Anthropology discipline provides insights for understanding the relationship of human with the environment, and the contributions of this discipline to OB field are in terms of organizational culture and its effects on human behavior.

Contributions of economics to OB are mainly related with organizational structure. Economic pressures, as well as other factors, affect the organizational structure design and change, and the structure forms the basis for employee behavior.

In today’s conditions, engineering discipline also impacts OB field in terms of occupational health and safety which has became a popular area of research.

Medicine discipline with its concern on psychical and psychological health, also contributed to the development of the field, the main topics are related to work-stress and well-being.