Which Statement Is NOT a Valid Criticism of Skinner's Theory

Multiple Choice

Which statement is NOT a valid criticism of Skinner's theory of language acquisition?

A) Grammar is rarely explicitly taught.
B) Language expression cannot be shaped by approximations.
C) Children generate many more grammatically correct sentences than what they could possibly hear.
D) Overgeneralization of grammatical rules suggests that trial-and-error grammar learning is not occurring.