Which of the following statements about nine to twelve years olds is false?

One of the following statements is false: A. Nine to twelve-year-olds typically show increased independence and seek more responsibility. B. Nine to twelve-year-olds often experience rapid physical growth and changes in their bodies. C. Nine to twelve-year-olds have fully developed cognitive abilities and can reason abstractly like adults. D. Nine to twelve-year-olds may begin to show interest in forming deeper friendships and social connections.

The false statement is C. Nine to twelve-year-olds have not fully developed cognitive abilities and cannot reason abstractly like adults. They are still developing their cognitive skills, including abstract thinking, which continues into adolescence.