A and C are much different.
How about B or C?
http://www.npr.org/2014/05/22/314874232/the-history-of-electronic-monitoring-devices
http://www.nij.gov/journals/269/pages/female-offenders.aspx
Electronic monitoring:
A. increases the importance of probation officers.
B. responds to the service needs of offenders.
C. has been subjected to extensive research.
D. none of the above
i'm confused between A and C
1 answer