When the nurse is dealing with the mental health of a patient, there must be an understanding of the way a patient performs any or all of the activities of daily life. This performance is called:

A. Adaptation Adaptation refers to how a person adjusts to stress or change, not the day-to-day performance of activities. B. Behavior Behavior encompasses a person's observable actions, including how they manage daily living, interact with others, and respond to internal and external stimuli. C. Regression Regression is a defense mechanism where a person returns to an earlier developmental stage, not a general term for daily functioning. D. Dealing with stress This is a coping strategy, not a definition for how daily life tasks are performed.