Final answer:
Organization-environment theory is the one that describes the impact of external forces on organizations, unlike scientific management or the human relations movement which focus on internal processes and employee satisfaction respectively.
Step-by-step explanation:
The theory that describes the impact of external forces on the organization is called organization-environment theory. This theory focuses on how external factors, such as competition, economic conditions, and societal shifts affect an organization's behavior and performance. It contrasts with other theories like scientific management, which emphasizes internal efficiency, and the human relations movement, which highlights the importance of social factors and employee satisfaction within the organization.