You are presented with the quiz "Doing what can cause sound to be made in stringed instruments?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "plucking a string can cause that string to vibrate" and "how the sounds are made Vibrating strings provide the sound in stringed instruments". 

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


 

      plucking     