Which of the Following Situational Changes Would Have Made It

Which of the following situational changes would have made it more likely that someone would have acted to help Kitty Genovese during her attack?

A) if more of her neighbours had been at home
B) if there had been more witnesses to the event
C) if people had telephones readily available
D) if some of the witnesses had just heard a lecture on the situational influences on helping behaviour