What is meant by the term "egocentrism?"
 a. a child lacks the ability to consider perspectives other than his or her own.
 b. a child is extremely arrogant and feels that he or she is better than others.
 c. a child is very selfish and refuses to share his or her possessions with others.
 d. a child lacks the motivation do things for him- or herself and expects them to be done by others?