Beatrice Is an Only Child, and Shelby Has Both a Sister

Beatrice is an only child, and Shelby has both a sister and a brother.Otherwise, both Shelby and Beatrice have similar home environments and family structure.Based on this description, which statement is the most accurate prediction of Beatrice's behavioural characteristics?

A) She will have higher self-esteem, but poorer peer relationships.
B) She will be more obedient and slightly more intellectually competent.
C) She will be more disruptive and more selfish.
D) She will have lower achievement motivation, but better peer relationships.