California Assessment of Student Performance and Progress (CAASPP) English Practice Exam

The phrase "Explain why" serves as a direct prompt to clarify reasoning and provide justification in an expository essay. This phrase encourages elaboration on the ideas presented, inviting the writer to break down their arguments or points with supporting evidence and clear explanations. Using this phrase helps establish a logical flow and ensures that the audience comprehends the rationale behind the information or viewpoint being discussed.

In contrast, other options serve different purposes. For instance, "Consequently" indicates a result or effect of a previously mentioned idea, while "Moreover" is used to add information or reinforce a point. "First" typically signals the beginning of a sequence or list, indicating the introduction of initial points rather than providing justification. Therefore, "Explain why" is the most effective signal for justifying reasoning within the context of an expository essay.