One Reason Given in the Text to Explain Why Rural

One reason given in the text to explain why rural people may be more prone than city people to offer assistance to people in need is that:

A) city dwellers are used to having to take charge in emergencies, and become blase about it
B) it is more likely that the stranger needing assistance in a city will belong to an unfamiliar group, whereas there is less diversity among people in rural areas
C) country dwellers are less in a hurry
D) both a and b
E) both a and c