After the Delivery of Their Baby, New Parents in Hospital

Multiple Choice

After the delivery of their baby, new parents in hospital A were given a poison-control test. While at the hospital they attended a training session on poison control. At the end of a week, they were given the poison-control test again. After the delivery of their baby, new parents in hospital B were given the poison-control test. One week later they were given the test again. What kind of design is being used?​

A) ​pretest-posttest control group:
B) time series.​
C) nonequivalent comparison group:​
D) cross-sectional design.​
E) ​multiple time-series.