The correct answer is B) stand.
If no safe shelter is available during an electrical storm, stand on the ground away from water.
Electrical storms are very dangerous. You need to immediately stop any activity in the outside and go indoors or to a safe shelter. If no safe shelter is available during an electrical storm, stand on the ground away from water. Stay away from any metal, avoid electricity, and turn off any computer, radio or TV.
The other options of the question were A) lie and C) sit.