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Because the population is denser there and the automobile is therefore inefficient as a means of transportation, a commuter rail system serving a given population is usually five times more efficient in a European city than it is in an American city.

a. serving a given population is usually five times more efficient in a European city than it is in an American city

b. serving a given population will usually be five times more efficient if it is placed in a European city instead of an American city

c. will usually be five times more efficient in a European city than one serving a comparable population in an American city

d.in a European city will usually be five times more efficient than will a system serving a comparable population in an American city

e. that is implemented in a European city will usually be five times more efficient than if it is implemented with a comparable population in an American city

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