The nurse is monitoring for signs and symptoms of dehydration in a 1 year old child who has been hospitalized for diarrhea and prepares to take the child's temperature. Which method of temperature measurement should be avoided?

A. Orally: Oral temperature measurement is generally not suitable for a 1-year-old because they are often not able to cooperate, but it is not contraindicated for the child. B. Tympanic: Tympanic (ear) temperature measurement is acceptable in children over 3 months old and is non-invasive. C. Rectal: Rectal temperature should be avoided in infants and toddlers with diarrhea due to the risk of rectal trauma and infection. Diarrhea may also cause irritation to the rectal area, increasing the risk of injury. D. Axillary: Axillary (underarm) temperature measurement is safe and commonly used in children, particularly for non-invasive monitoring.