Which of the Following Can Be Concluded from the Research

Which of the following can be concluded from the research of Hildy Ross and Avigail Ram?

A) Older sibling pairs experience greater hostility because their attitudes toward one another are less flexible.
B) Sibling conflicts inevitably involve some level of hostility but can generally be resolved.
C) Both social and cognitive gains can result from sibling experiences.
D) Young sibling pairs generally experience high-conflict situations.