Passage: "Many reviewees spend hours rereading notes, but research on learning shows that testing yourself is far more effective. When you try to recall an answer before checking it, your brain strengthens the path to that memory. Spacing your practice over several days also helps more than studying everything in one long session. A good plan, therefore, mixes short daily quizzes with regular review of the questions you got wrong." The word "therefore" in the last sentence shows that the sentence is:
Correct answer: A. A conclusion drawn from the previous ideas
"Therefore" introduces a conclusion based on what came before. The recommended plan follows from the earlier points about self-testing and spacing.
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