Which of these statements made by an EMT student shows he correctly understands capillary refill?

A) "Capillary refill is a reliable sign of perfusion in adults, but not as reliable in infants and children."
B) "Red flushed skin in the adult is a normal finding when assessing capillary refill."
C) "A capillary refill of 4 or more seconds in a patient of any age indicates that he or she is well oxygenated."
D) "For a capillary refill test to be normal for a child, it must be assessed at room temperature and be less than 2 seconds."

D) "For a capillary refill test to be normal for a child, it must be assessed at room temperature and be less than 2 seconds."