Final answer:
The noninvasive technique for measuring arterial blood oxygen saturation (SaO2) is C. Pulse oximetry, which uses a fingertip device to quickly assess a person's oxygenation status.
Step-by-step explanation:
The noninvasive technique that measures the oxygen saturation (SaO2) of arterial blood is C. Pulse oximetry. Pulse oximetry is a simple, noninvasive method of monitoring the percentage of hemoglobin (Hb) which is saturated with oxygen. The device known as a pulse oximeter is commonly used and is typically attached to a fingertip. By using two different wavelengths of light, the oximeter can determine the SaO2 based on the absorption of these lights by the oxygenated and deoxygenated hemoglobin in the blood. This is important for assessing a person's oxygenation status quickly and efficiently, which can be critical in medical settings, particularly to determine if the lungs are transferring oxygen into the blood sufficiently.