Hundreds of poor children in India have suffered from an acute brain disease each year since 1995. Children often develop epileptic symptoms early in the morning, and many children die quickly. This usually occurs from May to July each year. Litchi is abundant in the region, and May to July is the time when the litchi matures, so some people suspect that the disease may be related to litchi. Studies have found that all litchi contain methylene-cyclopropyl glycine and hypoglycin. These two substances are higher in content. Researchers believe that these patients are hypoglycin and methylene-cyclopropyl glycine poisoning, and the disease outbreak is indeed related to the large consumption of litchi. Which of the following, if true, best supports the above conclusion? ['Methylenecyclopropylglycine and hypoglycin were detected in urine samples of all children.', 'Residents have restricted the number of litchis eaten daily by children according to official recommendations, and the number of patients has decreased significantly after two years.', 'Sick children are more likely to have eaten lychee before their illness than children who have no symptoms.', 'Sick children are more likely to eat raw or rotten litchi than children without symptoms.']