Which of the Following Statements Is True of Relationships with Siblings

Which of the following statements is true of relationships with siblings in infancy and toddlerhood?

A) Constructive conflict is rarely seen between siblings till they are teenagers.
B) Sibling rivalry is the main pattern between brothers and sisters early in life.
C) Sibling conflict increases dramatically after the younger child reaches about 18 months of age.
D) Sibling conflict often inhibits children's ability to learn how to fight, disagree, and compromise.