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A recent study has shown that students who read for 20 minutes a day increase their vocabulary 100 times more than students who read for only five minutes a day.

Which of the following assertions would most weaken this argument?

A

The people with whom students interact will also increase the student's vocabulary.

B

The students who participated in the study came from the same first-grade classroom.

C

Students in the study already knew 1,000 vocabulary words.

D

Students from the study read the same story each day.

E

A different book was used during each reading session.

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