How does the following passage add to the author's development of her argument (paragraph 4)?
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I see my own publishers, in a silly panic of ignorance and greed, charging public libraries for an e-book six or seven times more than they charge
customers.
A. By providing an example of greed in the publishing industry
B. By contrasting the differences between publishers and public libraries
C. By explaining how revenue is typically generated in the publishing industry
D. By illustrating the widespread ignorance of customers