Which of the Following Actions Demonstrates That Parental Sensitivity Causes

Which of the following actions demonstrates that parental sensitivity causes secure attachment in children?

A) Parents who respond to their children's cries quickly are more likely than other parents to have children with secure attachments.
B) Children who are temperamentally easy are more likely to have secure attachments to their caregivers.
C) Parents who are taught to be responsive to their irritable children are more likely than parents who are not taught this to have children who are securely attached.
D) Adults who were securely attached to their parents during their childhood are more likely than other adults to have children with secure attachments.