A client at term arrives at the labor room experiencing contractions every 4 minutes. After a brief assessment, she’s admitted and an electronic fetal monitor is applied. Which of the following would alert the nurse to an increased potential for fetal distress ？（）
A．Weight gain of 30 lb (13.6 kg).
B．Maternal age of 32 years.
C．Blood pressure of 146/90 mmHg.
D．Treatment for syphilis at 15 weeks’ gestation.
