Tyler Is an Off-Duty EMT

Tyler is an off-duty EMT. He is more likely to stop and help with a car accident than his spouse Stephen, who is an English teacher. What makes Tyler more likely to stop

A) His training makes him more likely to notice a wreck.
B) He is hypervigilant looking for emergencies.
C) EMTs are general more responsible than English teachers.
D) He is more likely to know how to help than Stephen.