Final answer:
The correct format for the medication administration record (MAR) is option C: 5mg Morphine, subcutaneous, every 4 hours as needed for severe pain. This format follows the standard practice of stating the medication dose and route of administration, followed by the frequency and indication.
Step-by-step explanation:
The correct format for the medication administration record (MAR) is option C: 5mg Morphine, subcutaneous, every 4 hours as needed for severe pain. This format follows the standard practice of stating the medication dose and route of administration, followed by the frequency and indication. The other options either have incorrect order or do not provide all the necessary information.