Robert Levine and His Colleagues (1994)have Found Support for the Urban

Robert Levine and his colleagues (1994) have found support for the urban overload hypothesis.More specifically,they have found that it is more important to know ____ than to know ____.

A) population density (number of people per square mile) ; rural versus urban settings
B) where helpers are currently; population size
C) population size; where helpers grew up
D) where helpers are currently; where helpers grew up