Which of the following most logically completes the passage?
A business analysis of the Appenian railroad system divided its long-distance passenger routes into two categories: rural routes and interurban routes. The analysis found that, unlike the interurban routes, few rural routes carried a high enough passenger volume to be profitable. Closing unprofitable rural routes, however, will not necessarily enhance the profitability of the whole system, since_________.
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Aa large part of the passenger volume on interurban routes is accounted for by passengers who begin or end their journeys on rural routes
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Bwithin the last two decades several of the least used rural routes have been closed and their passenger services have been replaced by buses
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Cthe rural routes were all originally constructed at least one hundred years ago, whereas some of the interurban routes were constructed recently for new high-speed express trains
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Dnot all of Appenia's large cities are equally well served by interurban railroad services
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Ethe greatest passenger volume, relative to the routes' capacity, is not on either category of long-distance routes but is on suburban commuter routes
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