It's A right? I'm like 10000000% positive it is ...

A person trapped outside during a thunderstorm should

A) lie in a ditch or other low-lying area.

B) get out of a car and take shelter under a tree.

C) stay away from trees, water, and tall objects.

D) run away from the thunderstorm as quickly as possible

The correct answer is option C, stay away from trees, water, and tall objects.

Reason -

Whenever there is a thunderstorm, one must try to stay in place that are devoid of material conducting electricity. In case if some one hide under a tree during a thunderstorm, there are high chances that if lightning hits the tree, the ground charges will spread in all directions thereby leading to more serious causalities.

if it's a thunderstorm, that means there's lightning, not necessarily a tornado. You're thinking of a tornado. Lightning may strike trees, water, and tall objects, so it's best to stay away from them. The answer is C