The cases of Genie and Victor of Aveyron demonstrate that ______.

A) environmental triggers are necessary for language acquisition
B) language acquiisition is entirely biological
C) language acquiisition is universal regardless of context
D) language acquisition does NOT occur until at least 5 years old

The cases of Genie and Victor of Aveyron highlight the critical role of environmental exposure to language during a sensitive period in childhood for language acquisition. Both individuals missed this critical period and struggled significantly with language later on, demonstrating that environmental triggers are necessary for language acquisition.