Final answer:
The correct answer to the provided question is splitting, a psychological term referring to the failure to integrate both positive and negative aspects of someone's character.
Step-by-step explanation:
Failing to reconcile both positive and negative attributes into a whole understanding of a person, which may involve idealizing and devaluing them, is known as splitting. This phenomenon occurs when people or groups divide between two extremes on an issue or position, which is also referred to as polarization. It's important to differentiate splitting from other defense mechanisms like rationalization, where one justifies behaviors by substituting acceptable reasons for less-acceptable real reasons, or confirmation bias, which is the act of seeking out information that supports our stereotypes.