- The psychodynamic perspective was the first major school of thought in psychology, founded by Sigmund Freud. This perspective emphasizes the influence of the unconscious mind and early childhood experiences on behavior. It is considered the "first force" in psychology because it introduced the idea that unconscious factors, such as repressed desires and unresolved conflicts, shape our behavior and personality. This theory was groundbreaking during its time and laid the foundation for many subsequent theories in psychology.
- The humanistic perspective emerged in the 1950s as a reaction to the deterministic and reductionist views of the psychodynamic and behavioral perspectives. It focuses on individual potential, personal growth, and self-actualization. Humanistic psychologists, like Carl Rogers and Abraham Maslow, believed that people have an inherent drive to develop their personal potential and make choices that enhance their well-being. This perspective is considered the "third force" in psychology because it offered a new, more positive approach to understanding human behavior, focusing on the individual's capacity for growth and self-improvement.
Thus, the correct answer is:
\[
\boxed{A) Psychodynamic and Humanistic}
\]