Which of the following is supported by research on early self-development? A. Toddlers of the Nso people of Cameroon attain mirror self-recognition earlier than Greek toddlers.

B. Babies whose parents respond sensitively to their signals and encourage exploration tend to be advanced in self-development.

C. There are no cultural variations in early self-development.

D. German and Greek parenting practices reflect a proximal parenting style common in cultures that emphasize independence.