Final answer:
Summarization is the communication technique used at the end of a session or before transitioning to another topic to recap main points and clarify understanding. The correct answer is option C.
Step-by-step explanation:
A communication technique that is useful either at the end of a session or when moving to another topic is called Summarization. This technique involves concisely recapping the main points discussed, ensuring that there is a shared understanding, and preparing participants for the transition to a new topic or the conclusion of the current session.
Summarization can help reinforce learning, clarify any misunderstandings, and serve as a bridge to the next part of a discussion or lesson.