Final answer:
The MA would use a 5/8 inch, 22 gauge needle to administer an intramuscular injection in the dorsogluteal muscle of an adult. Option b.
Step-by-step explanation:
The appropriate length and gauge needle to administer an intramuscular injection in the dorsogluteal muscle of an adult would be a 5/8 inch, 22 gauge needle (option b).
The dorsogluteal muscle is located in the buttock area and is one of the recommended sites for intramuscular injections. A 5/8 inch needle is long enough to penetrate the muscle and deliver the medication effectively.
The 22 gauge needle refers to the thickness of the needle. It is commonly used for intramuscular injections as it allows for a smooth injection and minimizes discomfort for the patient.