Although Interview Questions Can Be Useful for Assessing a Person's

Although interview questions can be useful for assessing a person's degree of substance use, brief questionnaires can be helpful supplements to the interview because:

A) A diagnosis of dependence or abuse can be determined from scores on most questionnaires
B) They help to identify the degree of functional impairment and consequences of substance usage
C) People tend to be more honest about substance use when responding to questionnaires
D) Readiness for change is best evaluated with questionnaires