Why Do More and More Researchers Think That Birth-Order Influences

Why do more and more researchers think that birth-order influences on child development have been emphasized too strongly?

A) There are no clear patterns of birth-order influences on personality.
B) If we continue to study birth-order influences,our findings will create self-fulfilling prophecies that will perpetuate birth-order differences.
C) The pattern of birth-order influences that scientists have found makes little sense and is not very useful.
D) The overly simplistic model that suggests that birth-order effects are very large ignores the complexity of influences on a child's development.