Passage: "At 8:15 p.m., Trooper Davis responded to a two-vehicle collision on Interstate 26. She secured the scene with flares, checked both drivers for injuries, and requested EMS for one driver complaining of neck pain. She then began collecting statements and photographing the vehicles." According to the passage, why did Trooper Davis request EMS?

1. One driver complained of neck pain
2. Both vehicles were on fire
3. Traffic was backing up
4. A driver refused to give a statement