Well we can rule out B. because you could have not ridden a Skateboard, it's a risk each time you go out to ride.
C. is not it because you could not just take drugs, DON'T DO DRUGS! They are not helpful in anyway, except marijuana, (there is only one case of death by the stuff).
D. Burns from fireworks, stand back, don't get so close to them, and don't stick them in your crack....
Now this is my best educated guess, I could be completely wrong, but A. Hit by a drunk driver would be "Unintentional" and also "Unpreventable" because you in no way knew it was going to happen, and you also HAVE to drive places, and sometimes people are stupid and get drunk and attempt to drive.
Be smart don't drink and drive, it makes everyone safer on the road and keeps you from having a Breathalyzer in your car to have to turn it on.
