You are presented with the quiz "An elastic snapping causes the particles in the elastic to do what?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "arubber band snapping causes the particles in the rubber band to vibrate" and "elastics are rubber bands that connect the upper and lower braces". 

So, what's the best answer to the question?


 

       vibrate    