Following an earthquake, a client who was

问题：

Following an earthquake, a client who was rescued from a collapsed building is seen in the emergency department. He has blunt trauma to the thorax and abdomen. Which nursing observation most suggests the client is bleeding

A. Prolonged partial thromboplastin time (PTT).
B. Recent history of warfarin (Coumadin) usage.
C. Diminished breath sounds.
D. Orthostatic hypotension.