Community activist: If Morganville wants to keep its central shopping district healthy, it should prevent the opening of a huge SaveAll discount department store on the outskirts of Morganville. Records from other small towns show that whenever SaveAll has opened a store outside the central shopping district of a small town, within five years the town has experienced the bankruptcies of more than a quarter of the stores in the shopping district. The answer to which of the following would be most useful for evaluating the community activist's reasoning? ['In towns with healthy central shopping districts, what proportion of the stores in those districts suffer bankruptcy during a typical five-year period?', 'Have community activists in other towns successfully campaigned against the opening of a SaveAll store on the outskirts of their towns?', 'Do newly opened SaveAll stores ever lose money during their first five years of operation?', 'Do a large percentage of the residents of Morganville currently do almost all of their shopping at stores in Morganville?']