Following a vaginal delivery, the nurse places the neonate under the radiant warmer, provides naso-oropharyngeal suction, and dries the neonate's skin to elicit spontaneous respirations. The newborn heart rate is 100 beats/minute and remains apneic when the nurse flicks the soles of the feet. Which action should the nurse implement next?

Choice A reason: Blow-by oxygen via cannula delivers supplemental oxygen but does not address apnea directly, as it relies on spontaneous breathing, which this neonate lacks despite stimulation, making it insufficient for immediate respiratory support. Choice B reason: Assisting with intubation is a complex procedure requiring a neonatologist, but the nurse can act faster independently with positive pressure ventilation to address apnea, reserving intubation for persistent respiratory failure. Choice C reason: Starting an IV infusion in a scalp vein addresses hydration or medication needs but does not correct the immediate life-threatening issue of apnea, which requires urgent respiratory intervention first. Choice D reason: Positive pressure ventilation directly supports breathing by delivering air to the lungs, critical for an apneic neonate with a heart rate of 100 bpm, ensuring oxygenation and preventing further deterioration.