When Children Are in Piaget's Preoperational Stage,what Do They Often

Multiple Choice

When children are in Piaget's preoperational stage,what do they often have trouble distinguishing?​

A) They often seem not to distinguish between pleasant and unpleasant.
B) ​They often seem not to distinguish between appearance and reality.
C) ​They often seem not to distinguish between children and adults.
D) ​They often seem not to distinguish between happy and sad.