Select the correct text in the passage. Which sentence gives evidence for the main idea that talking on cell phones while driving is risky?
We all know the dangers of driving while talking on a cell phone. But did you know that driving while talking on a hands-free phone can be just as dangerous? Most people misunderstand the cause of cell phone driving accidents. They believe that using your hands to hold the phone while driving is the problem. It’s actually the brain that’s the problem. When you’re on the phone, your brain can’t focus as much on driving. Then you’re more likely to have an accident. A study by Carnegie Mellon University showed that just listening to someone else talk on a phone caused a 37 percent drop in concentration among drivers.