Which of the Following Sites Is Best Suited for Measuring

Which of the following sites is best suited for measuring oxygen saturation (pulse oximetry) ?

A) A polished ring finger of a client with pneumonia whose nail capillary refill time is 2.5 seconds
B) A pierced earlobe of a client with a closed head injury whose nail capillary refill time is 3.5 seconds
C) The ring finger of a client with Parkinson's disease that has a capillary refill time of less than 3 seconds
D) An earlobe of a client who is experiencing moderate diaphoresis with a nail capillary refill time of 3.5 seconds