Which of the Following Is True of Sibling Relationships

Which of the following is true of sibling relationships?

A) Siblings who engage in dramatic play develop a history of shared understandings that enable them to more easily resolve issues than those who do not.
B) Rivalry, hostility, and competition are more common than prosocial and play-oriented behaviors among siblings.
C) The quality of sibling relationships is more affected by the emotional and social adjustment of the younger child than the older one.
D) Generally, opposite-sex siblings are closer and play together more peaceably than same-sex pairs.