In a Study About Help to Quit Smoking,one Group of Participants

In a study about help to quit smoking,one group of participants received a single supportive phone call 10 days after attending a program on strategies to resist the urge to smoke.A second group received a weekly supportive phone call for 6 weeks after attending the same program,and a third group received no supportive phone calls after attending the program.What property of experimental research did the researcher employ in this study?

A) Quasi-experimental research-no control group
B) Random assignment to research groups
C) Manipulation of the intervention dose
D) Controlling for extraneous variables

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