How Do Only Children Differ from Children with Siblings on Measures

How do only children differ from children with siblings on measures of leadership, cooperativeness, and extraversion?

A) Only children are higher on leadership and cooperativeness, but lower on extraversion, compared to children with siblings.
B) Only children tend to score lower on all of these dimensions compared to children with siblings.
C) Children with siblings tend to score higher on leadership, lower on cooperativeness, and higher on extraversion, compared to only children.
D) There are no differences between only children and children with siblings on any of these dimensions.