The decoration of the house may cause leukemia. According to the preliminary statistics of the hospital's hematology department for more than a year, the children who came to the hospital to see the leukemia showed a common feature. Most of them had luxuriously decorated the house at home within six months before the onset of illness. Materials include landscaping paint, marble flooring, and other luxurious building materials. Leukemia children account for 90% of the total number of children with leukemia. Which of the following, if true, would best strengthen the above conclusion? ['A higher proportion of children among leukemia patients.', 'Children with leukemia who come to the hospital to see the economic status of their families.', 'In addition to the pollution of the decoration to the environment, the virus is also the main cause of leukemia.', "The age of the child who came to the hospital to see the leukemia, the parents' work, weight, height are basically the same."]