Good question.
The answer choice needs to explain difference in the perception of connectedness between urban and rural people.
a-The cost of living in exurbia is significantly lower than that in urban areas. - there is no discussion about cost of living
b-Rates of attendance at houses of worship are much higher in exurban areas than in urban ones. - if rates of attendance is higher that means people are getting chance to become social with people
c-Exurban school districts often spend more per capita on their students than do those in urban areas. - OOScope
d-The rate of violent crime is much lower in exurban areas than in urban ones. - nothing about crime, OOS
e-Many people who live in exurbia moved there from urban areas - even though many people move from urban to rural , this still does not prove that they moved because they were feeling less connected in urban areas and that is the reason they moved
The only two contenders to me were options B and E , after some analysis I can conclude B as clear winner