A 20-year-old woman who is at 32 weeks gestation is stabbed in the upper right chest. In the emergency department, her blood pressure is 80/60 mm Hg. She is gasping for breath, extremely anxious, and yelling for help. Breath sounds are diminished in the right chest. The most appropriate first step is to:
a) Administer tocolytics to inhibit contractions.
b) Perform an emergent cesarean delivery.
c) Administer crystalloid fluids and prepare for immediate intubation.
d) Place the patient in the left lateral decubitus position.