In a study, researchers wanted to compare the effects of honey and cough medicines on children with respiratory infections. The results showed that honey not only has an antitussive effect but also helps sleep, so researchers believe that for children with respiratory infections, honey More effective than cough medicine. Which of the following, if true, would most weaken the conclusion? ['It is understood that most cough medicines in many pharmacies are currently provided for adults and are not suitable for children under 6 years of age.', "Experiments show that some children's cough is caused by pulmonary fever, which can heal on their own after one week without medication.", 'c. Studies have found that the reason why honey has better cough relief may be that it can relax the throat of the tattooed emblem, not really treat the infection.', 'Some young children under the age of 1 should not eat honey, because honey may have a stimulating effect on the intestines of young children and cause diarrhea in children.']