A nurse is helping a father understand expected behaviors for his 8-year-old son. The nurse explains ...

A nurse is helping a father understand expected behaviors for his 8-year-old son. The nurse explains that by this age, the boy is in the concrete operations stage of development.
 
  What are the characteristics displayed by children at this level according to Piaget's theory of cognitive development? A) They have the ability to understand quantities such as weight and volume.
  B) They have the ability to solve complex problems.
  C) They have the ability to investigate and explore the environment.
  D) They have the ability to learn by touching.