People with a strong "D" personality style like to be in positions of authority, or where they can do things on their own terms. These people tend to be risk-takers and self-starters, as well as extremely goal-oriented and competitive. Furthermore, "D" style personalities are excellent problem-solvers, big-picture thinkers, and tend to respond well to logic, reason and information (but not emotion). The D-style has high ego strength, which could be perceived positively as confidence or negatively as pride.
The "D" Personality Style has an innate fear they will be taken advantage of by someone, especially by someone they trust. As a result, they tend to strive for positions of authority where they can be in charge of making decisions and controlling the environment.