Research on the use of cell phones while driving indicates that
A. the negative effect can be decreased by using "hands-free" units.
B. the problem with cell phones is that attention is distracted from the task of driving by the need to hold the phone and drive with one hand.
C. the main effect of cell phone use on driving safety can be attributed to the fact that attention is used up by the cognitive task of talking on the phone.
D. the public perception that using a cell phone while driving poses a significant risk to drivers' safety is, in fact, incorrect.
Answer: C
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