TOEFL Reading: ETS-TOEFL阅读机经 - K1373Y491CB8Y4S5L$

Which of the following can be inferred from paragraph 5 about the Gutenberg Bible? A. It was printed in Frankfurt. B. People with average incomes were not likely to own it. C. Numerous copies of it were sold at the Frankfurt book fair. D. It was one of the first expensive books to be sold to an international population.