A New York City Taxi Cab Driver Once Intervened and Stopped

A New York City taxi cab driver once intervened and stopped what he perceived to be a mugging in progress - even though it actually was a group of actors performing a scene for a television sketch.The taxi driver probably intervened due to ________.

A) pure stupidity
B) the absence of the bystander effect
C) the fact that he is a New Yorker
D) his feelings of empathy
E) a high level of egoism