In an LSAT Reading Comprehension passage, the author states: 'While many economists argue that deregulation invariably spurs innovation, the telecommunications sector provides a counterexample.' What is the primary function of this sentence?
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A
To refute all economic theories about deregulation
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B
To introduce a specific exception that complicates a general claim
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C
To argue that the telecommunications sector should be re-regulated
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D
To summarize the passage's main conclusion