Which of the following actions is illegal while driving?

Texting while driving is illegal because it significantly distracts a driver from the road. This activity divides a driver's attention among three critical tasks: reading the text, composing a response, and maintaining awareness of their surroundings. Such distractions lead to a higher risk of accidents and endanger the lives of the driver, passengers, and others on the road.

In contrast, listening to music does not typically create a distraction that's comparable to texting, as it often enhances a driver's experience without requiring visual engagement. Talking on a hands-free device allows a driver to communicate without compromising their grip on the steering wheel or needing to look at a screen. Similarly, using a vehicle's navigation system is generally considered safe, especially when it is set up prior to driving, as it aids drivers in finding their routes with minimal distraction if used properly. Therefore, texting while driving is actionable in terms of legal enforcement due to its high potential for causing accidents.