Which statement about hands-free cell phones is true?

Hands-free cell phones can still pose a distraction problem because they can engage a driver’s cognitive resources and attention, which are critical for safe driving. While hands-free devices allow for the operation of a phone without the need to hold it, they do not eliminate the potential for distractions that arise from conversation or multitasking. Research shows that even with hands-free technology, drivers can become less aware of their surroundings, react more slowly to emergencies, and miss important visual cues. This makes it crucial for drivers to understand that just because a device is hands-free, it doesn’t mean that it doesn't impair their concentration on the road.

The other choices present inaccurate notions: thinking that hands-free devices eliminate all distractions oversimplifies the issue, while the misconception that they are legal in all states fails to acknowledge that laws vary by state. Additionally, hands-free devices do not necessarily improve reaction times, as cognitive distractions related to conversation can slow down a driver's response.