Answer:
B. Some people will selflessly take extraordinary action to save people who are in danger because they feel responsible.
Step-by-step explanation:
In the "Witness Account of Panic on a Subway", Michael Wilson wrote about the one incident that he remembers about a man who was saved from an incoming train by two selfless men. The incident reveals the selfless deeds of some people who are willing enough to sacrifice their lives for the sake of helping others in times of need.
The brave acts of David Capuzzo and Chad Lindsey in their acts of saving those in need at crucial times reveals how some people are brave enough to selflessly take extraordinary action. They did it out of their feeling of responsibility, for the very thought of "if I don't, then who will?" forms the minds of the men. This sees to be the best expression of the text's central idea.