Piaget's Reliance on Children's Verbal Explanations of Their Reasoning May

Piaget's reliance on children's verbal explanations of their reasoning may have:

A) been too simplistic for young children.
B) been appropriate for false-belief tasks but not for perspective-taking tasks.
C) led him to focus too much attention on egocentric thinking in young children.
D) led him to underestimate their causal reasoning abilities.