Regarding young babies’ responses to temperature and pain, researchers have found that:

A. Newborns who received heel pricks at the hospital grimaced as the nurse was preparing the skin for another needle prick, indicating that they had learned from prior experience.

B. Infants are more likely to survive heart surgery if they receive light anesthesia rather than deep anesthesia that keeps them unconscious for a day after the procedure.

C. Swaddling, pacifiers, and drops of sugar water given orally were not effective in reducing infants’ pain.

D. Newborns are unable to tell the difference between something cold or something warm placed on their cheeks.