A cell phone or other portable electronic device can be dangerous for what reason?

Using a cell phone or other portable electronic device while driving poses significant risks due to multiple factors. First, dialing a number or texting occupies one of the driver's hands, which can reduce their ability to maintain proper control of the vehicle. This physical distraction can impede a driver's reaction time during critical moments.

Moreover, these devices can create substantial mental distractions. When a driver is engaged in a conversation or focused on typing a message, their cognitive capacity is divided. This can lead to a slower response to changing road conditions and an increased likelihood of missing important visual cues, such as traffic signals or pedestrians.

Additionally, there's the issue of visual distraction. Drivers often look at their phones to read messages or navigate, diverting their attention away from the road. This not only increases the risk of accidents but also decreases their situational awareness.

Considering these factors, it becomes clear why the correct choice encompasses all mentioned risks. Each aspect contributes to the overall danger associated with cell phone use while driving, making it imperative for drivers to refrain from using these devices to ensure their safety and that of others on the road.