Which of the following is considered a distracting behavior while driving?

Using a cell phone while driving is widely recognized as a distracting behavior due to the significant amount of attention it diverts from the road. Engaging in a conversation or text messaging requires cognitive processing and often visual attention that should otherwise be focused on driving. This distraction can impair the driver's ability to react promptly to road conditions, traffic signals, or sudden changes in the environment, thereby increasing the risk of accidents.

While listening to music, eating snacks, or adjusting the radio can also be distractions, they typically do not involve the same level of cognitive engagement and visual focus that using a cell phone requires. Many drivers can manage these activities with minimal impact on their driving performance, although they should still be done with caution. Thus, using a cell phone stands out as the most dangerous distraction among the options given.