A survey shows that children who have encyclopedias in their homes earn better grades in school than children whose homes lack encyclopedias. The researcher concludes that having encyclopedias at home improves grades. This conclusion is erroneous primarily because the researcher has incorrectly failed to allow for experimenter bias Answer A: failed to allow for experimenter bias A identified the independent variable Answer B: identified the independent variable B identified the dependent variable Answer C: identified the dependent variable C inferred correlation from causation Answer D: inferred correlation from causation D inferred causation from correlation