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 describe are largely speculation and are not based on evidence.
D) Birth order itself shows limited ability to predict behavior when all of the factors that influence behavior are considered.