It's a 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

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

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.