A study compared public schools that used metal detectors with public schools that did not, finding similar levels of students carrying concealed weapons in each. State a potential lurking variable that could affect the results of such a study. What is a potential lurking variable? O A. Not all public schools that used metal detectors may have done so with the same reliability. B. The students may not have responded honestly. C. The public schools that used metal detectors may have formerly had higher rates of students carrying concealed weapons. O D. There is no potential lurking variable. The study proves that public schools that used metal detectors accomplished nothing