Which client should be transferred from the general pediatric unit to the pediatric intensive care unit?

A 2-month-old with bronchiolitis; HR 140, RR 45 on 1 L O₂ nasal cannula, SpO₂ 96%

A 6-month-old with vomiting; ABGs pH 7.45, PaO₂ 90, HCO₃ 22, PaCO₂ 46

A 5-year-old with suspected meningitis who no longer recognizes his mother

A 3-year-old with absence seizures; 6 seizures in the last 24 hours