Answer:
The answer is: D. the set of mental, emotional and behavioral patterns unique to an individual.
Step-by-step explanation:
Personality psychology is a branch of psychology that studies personality and its variation among individuals. 
"Personality" is a dynamic and organized set of characteristics that a person possesses that uniquely influences their environment, cognitions, emotions, motivations and behaviors in various situations. 
The answer is: D. the set of mental, emotional and behavioral patterns unique to an individual.