Query about Question 4 from "The History of Printing Technology" [13471]

TOEFL TOEFL Reading
1

https://toefl.gregmat.com/quizzes/quiz/the-history-of-printing-technology (Question 4)

Here the paragraph doesn’t directly state what material was used by Bi Sheng. So im unsure how we came to the conclusion that option B is the right answer?

2

Hi @gautham227, thank you for bringing this issue to our attention. We’ve updated the passage.

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