A nurse is planning care for a 2-month-old infant following a surgical procedure. Which of the following pain rating scales should the nurse plan to use to determine the infant's level of pain?

The correct answer is A: FLACC scale. The FLACC scale assesses pain in infants and young children based on facial expression, leg movement, activity, cry, and consolability. This scale is appropriate for nonverbal infants like the 2-month-old in this scenario. The FACES scale (B) and OUCHER scale (C) are more suitable for older children who can communicate through facial expressions or words. The PANAD scale (D) is not a recognized pain rating scale for infants. Summary: FLACC scale is the best choice for assessing pain in nonverbal infants, while the other options are more suitable for older children or not valid for this age group.