Even Several Years Ago, Research Showed What About Adler's Birth

Even several years ago, research showed what about Adler's birth notions?

A) His notions have held up remarkably well over the years.
B) Contradictory findings are more the rule than the exception.
C) Results are highly qualified: Jordon and colleagues (1982) showed that first born males were the most indifferent to the interpersonal consequences of achievement.
D) Toni Falbo was quoted by a writer, "Birth order really explains a lot."