Final answer:
If the newborn is still apneic and limp after providing warmth, drying, and stimulation, the next action is to give free-flow supplemental oxygen.
Step-by-step explanation:
If after providing warmth, drying, and stimulation, the newborn is still apneic and limp, the next action is to give free-flow supplemental oxygen (option B). This is done to increase the oxygen level in the newborn's body and help with respiration. Supplemental oxygen can be delivered through a nasal cannula or a mask.