Answer:
C, to obtain evidence for criterion validity.
Explanation:
Dr. Sheffield who happened to be a clinical psychologist who have His area of specialty in treating pathological gambling.
Pathological gambling can be said to a situation when one finds it very hard to resist or avoid the urge or impulses to gamble.
Dr Sheffield created a measure of pathological gambling. In the measure there are 15 questions, which requires 20 minutes to complete.