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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?


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


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


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


Students from the study read the same story each day.


A different book was used during each reading session.

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