Question ID:PT1 S3 Q19 Passage:Train service suffers when a railroad combines commuter and freight service. By dividing its attention between its freight and commuter customers, a railroad serves neither particularly well. Therefore, if a railroad is going to be a successful business, then it must concentrate exclusively on one of these two markets. Stem:For the argument to be logically correct, it must make which of the of the following assumptions? Correct Answer Choice:CChoice A:Commuter and freight service have little in common with each other. Choice B:The first priority of a railroad is to be a successful business. Choice C:Unless a railroad serves its customers well, it will not be a successful business. Choice D:If a railroad concentrates on commuter service, it will be a successful business. Choice E:Railroad commuters rarely want freight service as well.