Final answer:
If the umbilical cord is wrapped tightly around the baby's neck and cannot be slipped over the head, the next course of action should be to support the baby's head and suction the nose and mouth.
Step-by-step explanation:
If the umbilical cord is wrapped tightly around the baby's neck and you have tried unsuccessfully to slip the cord over the head, your next course of action should be A. Support the head and suction the baby's nose and mouth.
In this situation, it is important to first ensure that the baby can breathe properly. Supporting the head helps to keep the airway open, while suctioning the nose and mouth helps to clear any mucus or obstructions that may be present. This can help prevent any potential complications and ensure that the baby receives enough oxygen.