A study of existing records of 27,000 automobile accidents involving children in Michigan found that about 10 percent of children who were wearing a seatbelt (group SB) were injured and that about 15 percent of children who were not wearing a seatbelt (group NSB) were injured. Which of the following statements should NOT be included in a summary report about this study?
(A) Driver behavior may be a potential confounding factor.
(B) The child's location in the car may be a potential confounding factor.
(C) This study was not an experiment, and cause-and-effect inferences are not warranted.
(D) This study demonstrates clearly that seat belts save children from injury.
(E) Concluding that seatbelts save children from injury is risky, at least until the study is independently replicated.