While assessing a 40-week gestation primigravida in active labor, the client's membranes rupture spontaneously and the nurse notes that the amniotic fluid is meconium stained. Which additional finding is most important for the nurse to report to the healthcare provider?
A. Contractions occurring every 2 to 3 minutes.
B. Fetal heart rate of 100 to 110 beats/minute.
C. Maternal blood pressure of 130/85 mm Hg.
D. Vaginal exam reveals a cervix 6 cm dilated.