Which of the following is true regarding the relationship between gender and prosocial (helping) behavior in middle to late childhood?
a. There is no significant relationship between gender and prosocial behavior in middle to late childhood.
b. Girls tend to display more prosocial behavior than boys in middle to late childhood.
c. Boys tend to display more prosocial behavior than girls in middle to late childhood.
d. The relationship between gender and prosocial behavior in middle to late childhood is inconsistent and varies depending on individual and contextual factors.