QID 401301:

Question asks to characterize the most like suggestion that would be made by the social interactionist theory of language: in this case the correct answer indicates that it is the result of both biological and social interactions, particularly those betwen children and caregivers. Knowledge that this is the crux of the social interactionist theory specifically is necessary to recognize this.

Incorrect answer options involve other scenarios that involve other forms of language learning that would be better characterized by other theories (learning theory, nativist theory, etc.).