Final answer:
The nurse will first check the patient's oxygen saturation. In a patient with a head injury and complaining of shortness of breath, it is important to assess their oxygen saturation levels to determine if they are getting enough oxygen.
Step-by-step explanation:
The nurse will first check the patient's oxygen saturation (option b).
In a patient with a head injury and complaining of shortness of breath, it is important to assess their oxygen saturation levels to determine if they are getting enough oxygen. This can be done using a pulse oximeter, which measures the amount of oxygen in the patient's blood. If the oxygen saturation is low, immediate intervention may be needed to provide supplemental oxygen and ensure proper oxygenation of the body.