A woman gave birth to a 7-pound, 6-ounce infant girl 1 hour ago. The birth was vaginal, and the estimated blood loss (EBL) was 1500 mL. When evaluating the woman's vital signs, which finding would be of greatest concern to the nurse?

Temperature 37.4°C, heart rate 100 bpm, respirations 18 breaths per minute, and blood pressure 126/68 mm Hg.

Temperature 37.9°C, heart rate 115 beats per minute (bpm), respirations 22 breaths per minute, and blood pressure 90/50 mm Hg.

Temperature 38°C, heart rate 80 bpm, respirations 16 breaths per minute, and blood pressure 110/80 mm Hg.

Temperature 36.8°C, heart rate 60 bpm, respirations 20 breaths per minute, and blood pressure 140/90 mm Hg.