Correct option is A. Dime novels, known in nineteenth-century England
as "penny dreadfuls," flourished because increased mechanization of printing and increased literacy rates made production of large numbers of these books profitable.
The sentence is correct as is: it has a sound structure with no grammatical errors. "Increased mechanization" corresponds with "increased literacy rates" thus maintaining the structure of the sentence. A is the best answer.
the reintroduction of the Olympic Games the establishment of Darwin’s theory of natural selection the publication of dime novels and penny dreadfuls the discovery of the link between germs and disease
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