Before beginning a study on the health effects of obesity,a group of researchers agree that,for the purposes of their study,anyone with a body mass index greater than 30 kg/m² will be considered obese.This is an example of a(n) A)control variable. B)operational definition. C)convenience sample. D)dependent variable.

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This is an example of an operational definition, where the researchers define obesity based on a specific measurement, in this case a body mass index greater than 30 kg/m². This allows for consistent and objective identification of individuals who meet the criteria for obesity, which is important for conducting a reliable study.

Before Beginning a Study on the Health Effects of Obesity,a