Concept:During a thunderstorm, lightning strikes can be deadly. Metal objects, open spaces, and tall trees attract lightning. Enclosed metal structures like closed cars act as Faraday cages, safely channeling current to the ground.
Explanation:A closed car provides excellent protection during a thunderstorm because its metal body conducts lightning around the occupants and into the ground.
Running on a roof is unsafe – it exposes you to direct lightning strikes.
Using an umbrella with a metallic end is dangerous because metal is a good conductor of electricity.
Taking shelter under a tall tree is risky – the tree may be struck by lightning or fall.
Therefore, staying inside a closed car is the safest choice among the options.
Answer:Option A: one should remain in a closed car.