Which Statement About the Effect of Parents' Differential Treatment of Siblings

Which statement about the effect of parents' differential treatment of siblings on the siblings' relationships with each other is true?

A) Children rarely detect true differences in parental treatment, and thus it has little effect on their relationships with their siblings.
B) Differential treatment is more likely to be a problem in early and middle childhood than in early adolescence, when adolescents can view it as justified.
C) Differential treatment is more likely to be a problem in early adolescence than in early and middle childhood, because adolescents' relationships are more emotionally charged than are the relationships of younger children.
D) Children can detect differential treatment and it is equally problematic for children of all ages.