Final answer:
The priority nursing intervention for a patient receiving parenteral iron dextran (INFeD) infusion is an intravenous test dose of 25 mg over 5 minutes must be administered option (B).
Step-by-step explanation:
The priority nursing intervention for a patient receiving parenteral iron dextran (INFeD) infusion is B. An intravenous test dose of 25 mg over 5 minutes must be administered. This is important to assess the patient's tolerance and potential allergic reactions to the medication. Following the test dose, the patient must be closely observed for any adverse reactions for at least 15 minutes before the full therapeutic dose is given. Administering the medication by deep subcutaneous injection (option A) or giving erythropoietin (option C) are not the priority interventions in this case.