A nurse is caring for a client who has a prescription for amoxicillin. Which of the following findings should indicate to the nurse the client is experiencing an allergic reaction to the medication?

A. Diarrhea can be a common side effect of amoxicillin, but it is not an allergic reaction. B. Nausea can also occur with amoxicillin, but it does not necessarily indicate an allergic reaction. C. Laryngeal edema is a severe allergic reaction and can cause difficulty breathing, which is a medical emergency. D. Cardiac dysrhythmia is not a typical sign of an allergic reaction to amoxicillin.