Campbell's "Reforms as Experiments" Article Includes a Description of an Evaluation

Campbell's "reforms as experiments" article includes a description of an evaluation of a state police crackdown on speeding in Connecticut. In conducting this study, Campbell used

A) an interrupted time series design, with comparisons made to similar states
B) a simple one-group interrupted time series design
C) a nonequivalent control group design, with comparisons made to similar states
D) a pretest posttest design (no control group)