❓ 문제 According to the passage, what is the main reason to replace the term 'critical period' with 'sensitive period'?
- A. A. Because adults can never achieve native-like proficiency in a second language.
- B. B. Because recent studies show that language learning is still possible after puberty, though less efficient.
- C. C. Because children are not the only ones who can learn languages easily.
- D. D. Because the brain loses all plasticity after puberty, making learning impossible.