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The correct answer is B.
Naming the central idea or main idea of a passage helps you read with greater focus. When you identify the main idea, it provides a framework for understanding the details presented in the passage and helps you concentrate on the primary message the author is conveying. This enhances overall comprehension and retention of the material.
Identifying the main idea can also indirectly aid in defining the topic (A) and understanding additional details (C), but the primary benefit is that it helps you read with a clearer focus, making it the most important reason.