My brother just took his exam and there was this reading passage about deforestation of rain forests. The questions were pretty easy; however, there was this question:

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> Which of these is the closest in meaning to the word "regenerate" in paragraph 2?  
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>  A. **repeat** B. **refine** C. **recover** D. **renew**
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And this question needed information from the following line from the passage:

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> [...] Some logged forests, if left alone, can **regenerate** in a few decades.
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Apparently, the answer is either **recover** or **renew**. So what do you think is the most correct answer in this context?