Final answer:
The correct answer is B. Actors and use cases, where actors represent the users or systems interacting with the software system and use cases describe interactions leading to outcomes.
Step-by-step explanation:
In the context of a context diagram, which is used in systems analysis to visually outline the scope of a system, the elements that represent a user's interaction with the system are actors and use cases. An actor in a context diagram is an entity that interacts with the system, typically representing users of the software, roles people play when interacting with the system, or other systems. A use case illustrates a system's behavior under various conditions as it responds to a request from one of the actors.
The correct answer to the student's question is B. Actors and use cases. Actors are the users or other systems that interact with the software system. Use cases describe the series of actions between the system and the actors that lead to a particular outcome.