Fact 1: Plucking a string can cause that string to vibrate.

Fact 2: Plucked stringed instruments are the harp, guitar, and harpsichord.

Given the two facts above, answer the question "what do you strum to cause vibration?" with the following options: 
- brass instruments
 - waves
 - nerves
 - mechanical
 - energy
 - sound waves
 - guitars
 - drums


 

       guitars  