Which Statement About Cognitive Mechanisms of Change Is True

Which statement about cognitive mechanisms of change is true?

A) Both general and domain-specific cognitive learning mechanisms exist to influence development.
B) Only general cognitive learning mechanisms, and not domain-specific cognitive learning mechanisms, exist to help children learn.
C) Only domain-specific cognitive learning mechanisms, and not general cognitive learning mechanisms, exist to help children learn.
D) It is unclear whether the cognitive learning mechanisms that children use are general or domain-specific.