Which of the Following Research Results Support the Notion of Sibling

Which of the following research results support the notion of sibling influence?

A) There is a significant level of concordance among brothers in terms of juvenile delinquency.
B) Children who enjoy a warm relationship with their parents tend to get along better with their siblings.
C) There is a significant level of concordance among natural siblings in terms of IQ.
D) Children who get along well with their siblings tend to get along well with their peers.
E) Siblings who are close in age often have the same prosocial peer group.