China's Policy of Limiting Families to One Child Has Facilitated

China's policy of limiting families to one child has facilitated several observations.Which of the following observations is correct?

A) Many observed personality differences exist between only children and children who have siblings.
B) Only children have poor or inadequate language skills because of the lack of sibling interaction.
C) Only children appear to have a distinct psychological advantage in a society that favors and rewards such a child.
D) Children with siblings have fewer overall behavioral problems because they have learned to take turns and share.