Final answer:
The false statement is that Adler believed birth order has no influence on personality; he actually proposed that it does.
Step-by-step explanation:
The statement about Alfred Adler that is FALSE is: According to Adler, birth order has no influence on the development of an individual's personality. Adler believed that birth order could impact personality and he described how different positions (oldest, middle, youngest) could affect individuals' characteristics. The other statements are true: Adler was indeed a key figure in the development of individual psychology, he believed that individuals are primarily motivated by a desire for superiority and perfection, and emphasized the role of social factors in shaping personality.