Final answer:
If the needle pulls out during a subcutaneous injection, the nurse should safely discard the needle and prepare for another injection attempt, along with documenting the incident and informing the primary care provider.
Step-by-step explanation:
When administering a subcutaneous injection and the needle pulls out of the skin upon releasing the skin fold, the appropriate next action for the nurse would be to c. Engage safety shield on needle guard and discard needle appropriately. After ensuring the needle is safely secured, the nurse would then need to prepare for another attempt at the injection, following the necessary steps of asepsis and patient safety, including obtaining a new needle and dose of medication, if required. It is also important to document the incident thoroughly, noting the attempts and any adverse outcomes, and to inform the primary care provider as per the protocol of the healthcare facility.