A nurse started a transfusion of packed RBCs for a client 1 hour ago. The client has suddenly developed shaking chills, muscle stiffness, and a temperature of 30.6 C (101.5 F). The client appears flushed and reports a headache and "nervousness". The nurse should identify that the client has most likely developed which of the following types of transfusion reaction?
A. Septic
B. Acute hemolytic
C. Allergic
D. Febrile nonhemolytic