Students were randomly assigned to two groups. One group listened to music while taking a math test and one group did not. The one that did not listen to music scored significantly higher on the math test than the other. A. Students should listen to music during math tests. B. Not listening to music during a math test results in higher math test scores. C. Listening to music during a math test results in higher math test scores. D. Cause-and-effect relationships cannot be drawn.