Which of the following situations would require an emergency move?

a. A motorcycle crashed into a pickup truck on a busy divided highway. The rider is severely injured and lying across both southbound lanes, which have been completely blocked by a tractor trailer that stopped following the collision. The northbound traffic continues flying past the scene at top speed.
b. An insurance company employee fell and hit her head in a stairwell during a prescheduled fire drill. She is unconscious and the other employees, unable to get past her, are beginning to crowd together on the stairs above the scene. Several floors above, somebody begins yelling at the line of people to start moving.
c. A man attempted to rob a bank, and when law enforcement arrived he began shooting at the police and at random bank customers. Within moments a team of five police officers entered the bank and found several customers unresponsive and bleeding on the marble floor of the lobby. Nearby, the robber was sitting against a wall, slumped over and apparently dead from a self-inflicted gunshot wound.
d. A speeding car swerved from the roadway and rolled over several times, coming to rest on its wheels in a cornfield. The windows are all shattered, the passenger door is crushed shut, and the driver's door was completely torn off and is lying a good distance from the scene. A gasping teenaged boy is wedged underneath the dashboard on the passenger side, and the car's driver, an adult woman, is responsive but has two broken legs and is unable to move from where she is lying across both front seats.

d