A good introduction should include D: context. The introduction sets the stage for the reader, providing background information and establishing the context for the main topic or argument that will be presented. This helps the reader understand the significance of the subject being discussed.
In contrast, a climax (A) typically appears in the middle of a narrative, a conclusion (B) wraps up the discussion, and chronological (C) order relates to the way events are organized and is not a specific element that must be included in an introduction.