Final answer:
Psychoanalysis is best defined as the analysis of the mind, focusing on the unconscious influences on behavior as developed by Sigmund Freud, utilizing techniques like dream analysis and free association for therapy.
Step-by-step explanation:
The best definition of the term psychoanalysis is D. Analysis of the mind. Psychoanalysis is a set of psychological and psychotherapeutic theories and associated techniques originally popularized by Austrian neurologist Sigmund Freud, and revolves around the idea that people's behaviors are heavily influenced by their unconscious mind. The methodologies for treating patients include dream analysis, free association, and the examination of slips of the tongue, which are thought to reveal the underlying repressed information in the unconscious mind. Psychoanalytic therapy aims to explore these unconscious elements and their influence on an individual's psychological state with the intention of resolving inner conflicts and mental disturbances originating from these hidden parts of the psyche.