Among the three options you provided, the Minnesota Multiphasic Personality Inventory (MMPI) would be the most appropriate maladaptive behavior screening tool for an 18-year-old.
Here's a brief overview of each assessment tool:
Minnesota Multiphasic Personality Inventory (MMPI): The MMPI is a widely used psychological assessment tool designed to assess personality traits, psychopathology, and mental health issues in adults. It consists of a large number of self-report items and has different versions for specific age groups. The MMPI-2 is commonly used for adults, including those who are 18 years old or older. It is especially suitable for identifying various psychological problems, personality disorders, and maladaptive behaviors.
Behavior Assessment System for Children (BASC): The BASC is a comprehensive assessment tool designed to evaluate the behavior and emotional functioning of children and adolescents between the ages of 2 and 25 years. While it can be used with individuals up to 25 years old, it is primarily targeted at children and adolescents and may not be the most appropriate choice for an 18-year-old.
Vineland Adaptive Behavior Scale (VABS): The VABS is used to assess adaptive behavior in individuals from birth to adulthood (up to age 90). It measures an individual's ability to perform everyday activities required for personal and social sufficiency. While the VABS can be used for individuals up to age 90, it may not specifically target maladaptive behaviors, making it less suitable as a maladaptive behavior screening tool for an 18-year-old.
Given that the individual in question is 18 years old, the MMPI would be the most relevant option among the three for identifying maladaptive behaviors and mental health concerns. However, it's important to remember that psychological assessments should be administered and interpreted by trained professionals, such as psychologists or licensed mental health practitioners, to ensure accurate and meaningful results. If you or someone you know is seeking a psychological assessment, it's best to consult a qualified mental health professional who can determine the most appropriate assessment tool based on the individual's specific needs and circumstances.