A school nurse is using the Weber's test to check a child's hearing acuity. Which of the following actions should the nurse take?

The correct answer is C: Place a vibrating tuning fork on the top of the child's head. This is the correct action for the Weber's test, a test used to assess hearing acuity. Placing the vibrating tuning fork on the head helps determine if sound is heard equally in both ears or if there is a hearing imbalance. This method allows for detecting conductive or sensorineural hearing loss. The other choices are incorrect because: A does not align with the purpose of the Weber's test, B is not necessary for the Weber's test, and D is incorrect as the tuning fork should be placed on the head, not near the ears.