Which of the following is derivable from Bowlby’s work?
A. Day care would not be so popular if it has noticeable negative effects on a child’s personality.
B. A child sent to a day care center before the age of three may have emotional problems in later life.
C. Day care nurseries have positive effects on a child’s development.
D. Mothers should not send their children to day care centers before the age of three.