Which of the Following Is a Statement About Cognitive Changes

Which of the following is a statement about cognitive changes during the first year of life?

A) Psychologists generally agree on the ages when children first represent the world conceptually.
B) Psychologists generally do not agree that development in the frontal cortex influences a child's ability to understand the world around him.
C) Psychologists generally agree that Piaget's reliance on actions as the measure for how much infants understand is valid.
D) Psychologists generally do not agree on the ages at which children first represent the world conceptually.