People believe that cellphones cause cancer, especially brain cancer. A few studies suggested a link with certain rare types of brain tumours __________. These studies didn't receive front-page coverage. Therefore, most consumers could not notice them.
Answer: D
Correct answer: But most studies show that there is no link between cell phone use and brain cancer
These studies didn't receive front-page coverage follows the blank, and these must point at studies named in it. The blank also has to begin with but, because the sentence before reports studies suggesting a link and the paragraph goes on to explain why the reassuring findings went unnoticed. The options about driving belong to a different argument.
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