The excerpt is an example of a strong argument because it It includes a clear topic sentence and provides effective support, as stated in option C.
A strong argument is one that clearly states the speaker's or writer's opinion about a subject in a topic sentence and then provides support through the use of evidence.
That is why the argument we are analyzing here is a strong one. The topic sentence is, "In a free enterprise system, companies can become more successful by beating their competitors in service and pricing." The support consists of providing an example about a specific company.
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