Use the Following to Answer Questions

Use the following to answer questions
Greenfield, B. L., Owens, M. D. & Ley, D. (2014) . Opioid use in Albuquerque, New Mexico: a needs assessment of recent changes and treatment availability. Addiction Science and Clinical Practice, 9: 10.
Prescription Opioid Use
This study was conducted by the researchers at the request of the city of Albuquerque, New Mexico. The researchers describe that the illegal use of prescription opioids has been increasing for decades in Albuquerque and has resulted in a substantial increase in opioid-related fatalities. In order to understand how to address the problem, the city of Albuquerque wanted to more fully understand the illegal opioid drug culture. To that end, the researchers conducted semistructured interviews in person or by phone with substance abuse treatment facility patients and administrators, healthcare employees, and advocacy groups in the Albuquerque area. Each interview lasted from 20 to 60 minutes and was recorded for transcription; common themes were then assessed. The results of the interviews suggest that opioid use is most widespread among young people and that the negative stigma associated with opioid use may prohibit users from seeking treatment. The authors conclude that the city of Albuquerque should consider focusing outreach efforts toward young adults.
-Suppose each interviewee was asked to rate the extent to which illegal opioid drug use is a problem by using a 10-point scale where 0 = no problem and 10 = huge problem. Several years later, after a prevention program had been established, individuals were again asked to indicate how much a problem opioid drug use is. Which type of test would be used to determine whether opioid drug perceptions changed?

A) a t-test
B) content analysis
C) an ANOVA
D) a correlation