Lisa Rides the Train to Work and Always Gets Off

Lisa rides the train to work and always gets off at stop A. One Saturday she has to go into town, and rides the same train she takes to work. She is supposed to get off at Stop F, but she starts talking to her mother on the phone and gets off at stop A. What does this tell us about unconscious processing?

A) Unconscious processing is impossible.
B) If not consciously attending to what we are doing, we will rely on habit.
C) Unconscious processing only causes problems.
D) People tend to make the same mistakes over and over again.