Which Statement Is Supported by Research on Sibling Rivalry

Which statement is supported by research on sibling rivalry?

A) In middle childhood, siblings become more important sources of support than in the past, so sibling rivalry decreases.
B) For opposite-sex siblings who are close in age, parental comparisons are more frequent, resulting in more antagonism.
C) Destructive sibling conflict in middle childhood is associated with negative outcomes, including anxiety and depressed mood.
D) To reduce rivalry, siblings often strive to be more alike, selecting the same athletic and academic pursuits.