The Behaviorist Theory of Language Accounts for All of the Following

The behaviorist theory of language accounts for all of the following aspects of language development EXCEPT:

A) grammar develops despite parents not spending much time teaching it to their children.
B) children generate grammatical sentences they have never heard.
C) children's language errors are overgeneralizations of rules instead of imitations of heard speech.
D) children need to be taught the rules of grammar explicitly.