Hellloooo!
The answer would be option A: Driving while distracted.
Each day in the United States, approximately 9 people are killed and more than 1,000 injured in crashes that are reported to involve a distracted driver. Distracted driving is driving while doing another activity that takes your attention away from driving. Hence why distracted driving can increase the chance of driving fatalities.
Hope that helped better explain! Good luck. :-)