What activities could pose a highly risky distraction while driving?

The selected combination is correct because all three activities significantly distract drivers and increase the risk of accidents. According to German traffic regulations, drivers must remain fully attentive and minimize distractions while operating a vehicle.

Entering an address in a sat-nav requires visual and cognitive attention, which diverts focus from the road. Writing a text message is very dangerous as it involves both manual and cognitive distractions, making it highly unsafe. Using a telephone through a hands-free unit can still be distracting because it engages the driver in a conversation that may divert their focus from driving.

Together, these activities exemplify why it’s critical to address all potential sources of distraction to ensure road safety. Ignoring any of these can lead to serious consequences under German law.