A control series design is a(n) _____ design with a comparison group.

A) true experimental
B) interrupted time series
C) outcome series
D) multiple baseline

An interrupted time series design is a quasi-experimental design that includes a comparison group. This design involves making observations over time, then introducing an intervention, and continuing to make observations to assess the intervention's impact. Unlike true experimental designs, which require random assignment to groups, interrupted time series designs can provide strong evidence of causality in situations where random assignment is not feasible.