The Increased Risk of Car Accidents for Drivers Talking on a Cell

The increased risk of car accidents for drivers talking on a cell phone

A) results primarily from the visual distraction of glancing at one's cell phone.
B) is no greater than the risk for drivers chatting with other passengers.
C) is no greater than the risks for drivers listening to a car radio.
D) is equally great for those using handheld and those using hands-free phones.