The nurse has just received the change of shift report on the following clients on the labor, delivery, recovery, and postpartum unit. Which of these clients should the nurse assess first?

A An 18-year-old single primigravid client, in labor for 9 hours, with cervical dilation at 6 cm, 0$ station, contractions occurring every 5 minutes, and receiving epidural anesthesia. B A 24-year-old multiparous client who delivered a 4,200g infant 2 hours ago, whose fundus is firm and who is having light lochia flow. D A 35-year-old primigravid client, 36 weeks' gestation, who was admitted with preterm labor and is receiving magnesium sulfate therapy. C A 30-year-old multigravid client who delivered a 3,500g infant 6 hours ago by cesarean section and who is complaining of abdominal pain at the incision site.