The following text is from a neuroscience article.
The brain's plasticity—its ability to reorganize neural connections—extends well into adulthood. London taxi drivers, who must memorize complex street layouts, show enlarged hippocampi compared to bus drivers following fixed routes. Musicians demonstrate enhanced connectivity in areas governing motor control and auditory processing. These findings challenge earlier beliefs that brain structure becomes fixed after childhood.
Which choice best describes the function of the last sentence?
It questions whether the studies cited are accurate.
It provides technical details about brain anatomy.
It summarizes the implications of the evidence presented.
It introduces a new topic unrelated to brain plasticity.
Correct Answer: C
Choice C is the best answer. The last sentence summarizes what the evidence implies: that earlier beliefs about fixed brain structure were wrong.
- Evidence: The sentence states: "These findings challenge earlier beliefs that brain structure becomes fixed after childhood."
- Reasoning: It synthesizes the specific examples (taxi drivers, musicians) into a general scientific conclusion.
- Conclusion: The function is to summarize implications.
💡 Strategy: Look for phrases like "These findings challenge..." which indicate a summary of significance.
Choice A is incorrect because accuracy isn't questioned. Choice B is incorrect because technical details aren't added. Choice D is incorrect because it continues the plasticity topic.