The audience the audio is most likely for are dental assistants, option A,
It is about the Parkland formula, which is used to calculate the amount of fluid that should be administered to a patient with burns in the first 24 hours after the burn. This information is specifically relevant to dental assistants, as they are responsible for providing care to patients with burns.
Medical residents and student hygienists may also find the information in the audio to be helpful, but it is not as directly relevant to their practice areas. Young children are not likely to be interested in the information in the audio. The audience the audio is most likely for are dental assistants, option A,