The approach to the study of individual differences that concentrates on intensive studies of individuals is the __________ approach.

A) idiographic
B) trait
C) nomothetic
D) locus of control

The idiographic approach focuses on the unique characteristics and experiences of individuals through intensive case studies, while the trait approach looks at the traits that distinguish individuals from one another. The nomothetic approach aims to identify general laws or principles that apply to groups of individuals. Locus of control refers to an individual's belief about whether they have control over the outcomes of their actions or if external factors are responsible. Therefore, the best choice is A) idiographic approach.