Why is the librarian unsure that the scheme caused the change?

A school librarian noticed that many students read only when a teacher required it. She started a scheme in which each student chose any book, read for fifteen minutes at the start of the lesson, and then told a classmate one thing about it. No marks were given. After a year, the library recorded that borrowing had doubled, and several teachers reported that students wrote longer answers in class. The librarian says she cannot be sure that the scheme caused the change, because the school also bought new books during the same year.

Answer and explanation

Correct answer: B. Because the school also bought new books during the same year

  1. Step 1: The last sentence gives the reason. Step 2. A second possible cause, new books, occurred in the same year. Answer: Because the school also bought new books. Why not the others: The other reasons are not given in the passage.

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