Question: Select the statement that expresses an approach used with experiments. O a.) The researcher should have control over some of the variables. O b.) The

Select the statement that expresses an approach used with experiments. O a.) The researcher should have control over some of the variables. O b.) The researcher should not have control over any variable. O c.) The researcher should have control over exactly one variable. O d.) The researcher should have control over all of the variables

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