Final answer:
The nurse should use option c. Have the primary health care provider prescribe the liquid form of the drug when administering a subcutaneous injection.
Step-by-step explanation:
The nurse should use option c. Have the primary health care provider prescribe the liquid form of the drug when administering a subcutaneous injection. Subcutaneous injections involve injecting medication into the tissue layer between the skin and the muscle. It is typically done using a needle and syringe, and the medication needs to be in liquid form to be administered correctly. Crushing the pill and mixing it with applesauce (option b) or having the client self-administer the pill (option d) are not appropriate for subcutaneous injection.