If researchers wanted to see if subliminal messages (which generally have no effect on any behaviors) in stores would be useful in reducing shoplifting, an investigator could monitor the degree of shoplifting in each of three weeks in an initial

phase, then begin the subliminal messages, and monitor shoplifting following introduction of the subliminal stimuli for three more weeks. This kind of design would is a

a. static-group comparison design.
b. time series design.
c. nonequivalent control group design.
d. one-group pretest-posttest design.

B