OA. A lurking variable is a quantitative variable that has an infinite number of possible values that are not countable. In addition, lurking variables are typically very large numbers that make them difficult, if not impossible, to include in a study. OB. A lurking variable is a quantitative variable that has either a finite number of possible values or a countable number of possible values. In addition, lurking variables are typically equal to zero, or almost equal to zero. C. A lurking variable is an explanatory variable that was not considered in a study, but that affects the value of the response variable in the study. In addition, lurking variables are typically related to explanatory variables in the study. OD. A lurking variable is a response variable that was not considered in a study, but is also affected by the casual relationship of the explanatory variables in the study. In addition, lurking variables are typically related to response variables in the study. What is a confounding variable? OA. A confounding variable is a response variable that was not considered in a study whose effect cannot be distinguished from a second explanatory variable in the study. OB. A confounding variable is the explanatory variable on which a study has been focused. OC. A confounding variable is an explanatory variable that was considered in a study whose effect cannot be distinguished from a second explanatory variable in the study. OD. A confounding variable is a response variable that has an effect on the explanatory variable, but it cannot be accurately measured in the study.