Large-Scale Studies on the Effect of Birth Order on Personality

Large-scale studies on the effect of birth order on personality characteristics

A) have found that first-born children are more conservative and conforming than later-born children.
B) have found that first-born children are more unconventional and rebellious than later-born children
C) have found that first-born children are more socially skilled and popular than later-born children.
D) have not consistently confirmed differences.