According to Chomsky,which observation of language challenges a behavioural account?

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Speech that has never before been reinforced nevertheless occurs frequently challenges a behavioural account of language as it suggests that language acquisition cannot be solely explained through reinforcement and imitation. Chomsky argued that humans have an innate capacity for language, which he called the "language acquisition device" that allows us to acquire language naturally and rapidly.

According to Chomsky,which Observation of Language Challenges a Behavioural Account