Final answer:
The correct answer is c) Consistency in behavior across situations, as per the DSM-5, which describes that personality disorders exhibit enduring and inflexible patterns of behavior that are consistent across various contexts.
Step-by-step explanation:
The criteria for personality disorders in the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5), specifies that a personality disorder is characterized by enduring and inflexible patterns of behavior and thinking that deviates significantly from cultural expectations. These patterns are pervasive and stable over time, and lead to distress or impairment. Specifically, the DSM-5 emphasizes that the behavior patterns must be consistent across different situations, which matches with one of the multiple-choice options provided.
The correct answer to the question is therefore: c) Consistency in behavior across situations. Personality disorders exhibit a long-standing and rigid pattern of experience and behavior that deviates markedly from the expectations of a person's culture, is pervasive and inflexible, has an onset in adolescence or early adulthood, is stable over time, and leads to distress or impairment.