Final answer:
The nurse should use a tuberculin syringe when administering a subcutaneous injection.
Step-by-step explanation:
When administering a subcutaneous injection, the nurse should use a tuberculin syringe, which is option c. A tuberculin syringe is specifically designed for delivering small volumes of medication in a subcutaneous injection. It typically has a capacity of 1 mL, a fine-gauge needle (usually 25 gauge), and a short length needle (usually 1/2 inch long).