The best evidence that there is a critical period for learning language is the fact that

Question

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The fact that people most easily master the grammar of a second language during childhood is strong evidence for the critical period hypothesis. Studies have shown that language acquisition becomes more difficult after a certain age, suggesting that there is a limited window of time during which the brain is particularly receptive to language learning. The other options (A, B, and D) are also related to language acquisition but do not provide as clear and direct evidence for the critical period hypothesis.

The Best Evidence That There Is a Critical Period for Learning