Of the following examples, which one is not an open-ended question?

The option that is not an open-ended question is one that seeks a definitive answer, typically requiring a simple or binary response. The question asking whether an expression is a simile or a metaphor prompts an answer that is either "simile" or "metaphor." This format indicates that the question expects a specific classification rather than a more elaborate discussion or exploration of ideas.

In contrast, the other questions invite more expansive thought and discussion. For instance, the question about the climax of a story allows for an exploration of the narrative structure and different interpretations. Similarly, asking how similes and metaphors differ encourages a comparison and discussion of their characteristics, while the question on reasons for poverty opens up a conversation about social, economic, and political factors. These prompts require more than a simple yes or no answer, thereby qualifying them as open-ended questions.