To Control for History Effects in an Interrupted Time-Series Study

Multiple Choice

To control for history effects in an interrupted time-series study, a researcher decides to use an A-B-A format in her study. This means that she

A) increases the number of testing intervals in her study.
B) includes a comparison group that does not receive the treatment.
C) takes away the treatment to determine if behavior reverts back to baseline.
D) adds another treatment condition to the study.