Correct option is C
For effective bag–mask ventilation in newborns, oxygen flow rate should be set at 10–15 L/min, with 15 L/min being the standard recommendation.
Explanation of options: (a) ✘ 5 L/min is inadequate for proper bag inflation. (b) ✘ 10 L/min is minimal, but preferred is 15. (c) ✔ Correct; 15 L/min ensures optimal flow for resuscitation. (d) ✘ >20 L/min increases barotrauma risk.