In their report, the researchers stated that "after adjusting for various demographic and lifestyle variables, daily consumption of two or more servings was associated with a 30% reduced prevalence of high cholesterol." why was it important to adjust for these variables? a. the researchers wanted to ensure that the study was representative of the entire population, so they were likely to adjust the responses to match actual data collected for the entire population. b. the researchers were sure that various demographic and lifestyle variables had greater influence than daily consumption of two or more servings. c. the researchers wanted to ensure that the sample was large enough in order to perform inference. d. the researchers may be concerned with confounding that occurs when the effects of two or more explanatory variables are not separated or when there are some explanatory variables that were not considered in a study, but that affect the value of the response variable. click to select your answer.