In Which of the Following Situations Is the Person Most

In which of the following situations is the person most likely to be helped?

A) A young woman is being mugged while people are watching from their bedroom windows.
B) An old woman trips and falls while crossing an isolated street with one other person.
C) An angry mob watches while an old man is attacked by a dog.
D) A woman collapses on the sidewalk of a crowded street.