Under what condition is using a cell phone while driving prohibited?

Answer: B — When the phone must be handheld or physically picked up

Using a cell phone while driving is prohibited when the phone must be handheld or physically picked up because this action directly distracts the driver and impairs their ability to maintain full control of the vehicle. Holding and using a phone requires physical manipulation, which takes the driver's hands off the steering wheel and their attention away from the road. This significantly increases the risk of accidents, as multitasking in this manner can lead to decreased reaction times and poor judgment while driving. Focusing on this restriction reflects a broader understanding of safe driving practices, emphasizing the importance of keeping both hands on the wheel and being fully attentive to driving conditions. Laws and regulations surrounding cell phone use while driving aim to promote safety by reducing distractions caused by mobile devices.