Final answer:
The correct answer to which option is not an environmental actor in an information system is E) Sales force, because it is part of the internal staff and not an external entity.
Step-by-step explanation:
The question asks which of the listed options is not an example of an environmental actor in an information system. When we talk about environmental actors in the context of business and information systems, we are referring to external entities that can affect or are affected by the system. This can include competitors, regulatory agencies, customers, and suppliers, which are all entities that have a direct impact on the system from outside an organization. However, the sales force is generally considered part of the internal operations of an organization. Therefore, the correct answer is E) Sales force, as it is typically not an external entity but rather part of the internal staff within a company.