The nurse is caring for several patients receiving chemotherapy. What patient will the nurse assess first? A. The patient receiving doxorubicin (Adriamycin) with a history of angina B. The patient receiving fluorouracil (5-FU, Adrucil) with an elevated platelet count C. The patient taking cyclophosphamide (Cytoxan) who is urinating 100 mL/hr D. The patient receiving mechlorethamine (Mustargen) with pain at the IV insertion site