A nurse is caring for a newborn whose mother voices concerns about sudden infant death syndrome (SIDS). The nurse should include which of the following statements in a discussion with the mother?

Rationale: A. Sleep apnea is not the main cause of SIDS; the exact cause remains unknown. B. SIDS rates have declined, not risen, over the past decade due to safe sleep campaigns. C. Placing infants on their backs to sleep on a firm mattress, without soft bedding or toys, is a key preventive measure to reduce SIDS risk. D. There is no evidence linking DTP or other routine vaccines to an increased risk of SIDS.