According to Baum-Snow and Kahn (2005), what is the real benefit of expanded rail transit, as found by this research? a) Less Pollution b) Welfare gains from commuting Time saving for commuters c)...

According to Baum-Snow and Kahn (2005), what is the real benefit of expanded rail transit, as found by this research? a) Less Pollution b) Welfare gains from commuting Time saving for commuters c) Centralization of the Population d) Welfare Gains to non-commuters