What Was the Key to Hull House's Success in Its

What was the key to Hull House's success in its anti-poverty mission?

A) Establishing settlement houses where workers lived in the neighborhoods they serviced.
B) A philosophy that recognized the hardships of slum life as often being beyond the individual's control.
C) Its emphasis on creating a social center with art and educational programs and a nursery.
D) All of these choices
E) None of these choices