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Which of the following best demonstrates that there is a critical period for language acquisition?
Infants babble sounds that occur in their parents' native language.
Toddlers maintain a capacity to discriminate language sounds they have never heard.
Children who were never exposed to language early in life, like the case of Genie, never become fluent in language later in life, despite intense remediation.
Grammatical systems are similar in all languages.
The stages of language development are universal, being similar in all cultures.