What would be the first thing you would do if your clothes caught fire while working in a laboratory?

A - Call out to your teacher

B - Drop and roll on the floor to extinguish the fire

C - Run towards a source of water to extinguish the fire

The correct answer is B. drop and roll on the floor to extinguish the fire. A is incorrect because you'd be wasting time doing that. C is incorrect because there may not be a source of water in a lab, so you'd be wasting time here as well. Your best option is just to drop and roll on the floor, in order to extinguish the fire, and then you'll be safe.