A limiting factor in research of personality is that subjects

According to the chapter They Don't Look the Same to Meabout homogeneity and heterogeneity biases,

assumptions or generalizations that people apply to all of the members of a group are called: (a) discrimination (b) out-group heterogeneity bias (c) stereotypes (d) cognitive dissonance

Your nephew has always been "strong willed" and has a difficult personality. He is now in early childhood and is very aggressive in most things that he does. Your brother is concerned and asks you what your thoughts are. You tell him that _____

he should be concerned, aggressive behavior in early childhood is a predictor of aggression in adolescence and adulthood he should not be concerned, most children in early childhood go through this phase and will eventually stop being aggressive he should be concerned, but there is nothing that he can do as it turns out, very aggressive children during early childhood perform at superior levels in school