A 65-year-old woman with metastatic breast cancer has severe constant bone pain despite regular Paracetamol and Ibuprofen. She is opioid-naïve. According to NICE palliative care guidance, which is the most appropriate next step for pain control?AStart a transdermal fentanyl patchBStart regular oral sustained-release morphine with immediate-release morphine for breakthrough painCStart codeine phosphate 15 mg as requiredDStart intravenous morphine via syringe driver immediatelyEPrescribe diazepam to help her sleep through the painCheck my answer