From the choices above, the safest thing to do if you are outside during a thunderstorm would be C. Squat low to the ground in an open area.
If you cannot find/get to shelter during a thunderstorm, the safest thing to do would be to get as low down as you can. You don't want to be the tallest when there's a thunderstorm.
I hope I could help! :) please mark Brainliest.