Identify an Accurate Statement in the Context of the Study

Identify an accurate statement in the context of the study conducted by Schachter (1963,1964) on the first-borns and later-borns.

A) First-borns tend to be lower in IQ than later-borns.
B) First-borns tend to be more dependent on other people than later-borns.
C) First-borns tend to be less obedient than later-borns.
D) All of these are correct.