You are presented with the question "What vibrates the saddle?" and the following answer choices: 
- voltage
 - friction
 - nerves
 - heat energy
 - mechanical
 - plucking
 - energy
 - waves

Now knowing that plucking a string can cause that string to vibrate and when the strings on a guitar vibrate, they transmit their vibrations to the saddle, choose the best answer.


 

      plucking   