Which method did Alfred Adler use to study personality?

Alfred Adler's approach to studying personality emphasized a holistic view that considered the individual within their social context. He introduced the concept of "social interest," which underlines his belief that a healthy personality develops in the context of social relationships and community involvement. Adler viewed individuals not merely as isolated entities but as part of a larger social fabric, emphasizing the importance of considering one’s social environment in the understanding of personality development.

Method A aligns with Adler's theories very well as he argued that striving for success is grounded in the individual’s relationship with others, thereby shaping their character and behavior. His focus on social interest as a fundamental component of personality underscores the significance he placed on community, cooperation, and contribution to society, which are vital in his understanding of human functioning.

Other methods outlined in the options, such as behavioral analysis, experimental observation, and biological examinations, do not encapsulate Adler’s perspective. While these methods may provide valuable insights within their respective fields, they lack the depth of social consideration that characterizes Adler's approach to understanding personality. Therefore, the focus on a holistic approach that prioritizes social interest is the reason why this method is the correct choice in studying Adler's contribution to personality theory.