Which of the following is a safe practice for using a cell phone while driving?

The safe practice for using a cell phone while driving is to pull safely off the road before making a call. This approach ensures that the driver can concentrate completely on the task at hand—making the call—without the distractions and risks associated with driving. By doing this, the driver minimizes the potential for accidents that can occur due to divided attention between operating the vehicle and handling a phone conversation.

Other options suggest practices that are generally unsafe. Making calls while stopped at a traffic light could still divert focus away from the surroundings, increasing the risk of missing important cues like pedestrians or vehicles. Holding the phone in one hand while driving compromises the driver's ability to maintain full control of the vehicle, as one hand is occupied. Lastly, having passengers handle phone calls might seem safe but can still create distractions, as conversations can lead to divided attention. Thus, safely pulling off the road is the best practice for maintaining safety while utilizing a cell phone.