Which of the following activities is considered illegal while driving?

Listening to music through headphones that cover both ears is considered illegal while driving because it significantly reduces your ability to hear important sounds in your environment, such as sirens, horns, or other vehicles approaching. This impaired auditory awareness can lead to unsafe driving conditions. The law is designed to ensure that drivers remain aware of their surroundings and can react promptly to any potential hazards on the road.

In contrast, using a hands-free device is permissible because it allows drivers to remain more aware of their surroundings while still being able to communicate. Listening to music through one earbud does not legally impede your ability to hear critical sounds, although it is still discouraged for safety reasons. Talking on the phone can be legal if a hands-free device is used, as it allows you to keep your hands on the wheel and your focus on driving.