Frank Sulloway's (1996,2001)research on the Relationship Between Birth Order and Personality

Frank Sulloway's (1996,2001) research on the relationship between birth order and personality shows that

A) younger siblings tend to be more agreeable than older siblings.
B) older siblings tend to be less honest than younger siblings.
C) younger and older siblings are equally open to novel ideas and experiences.
D) older siblings tend to be less achievement oriented than younger siblings.