In Which of the Following Scenarios Are People MOST Likely

In which of the following scenarios are people MOST likely help another person?

A) At a moderately crowded Greyhound bus station, a woman struggles to retrieve her suitcase from a man who shouts at her, "Do you understand? You're not leaving!"
B) Just moments after hundreds of people get off a crowded subway train on their way to work, an oddly dressed man in the crowd stumbles and falls as he is walking up the exit steps.
C) Carla's car won't restart and partially blocks the exit drive as her fellow employees are walking to their own cars.
D) As the impatient crowd surges forward to enter the stadium in the race for the best possible seats for the concert, a man in the crowd yells, "Wait! Stop! I dropped my contact lens!"