- Vibrations are a source of sound
- Plucking a string can cause that string to vibrate
- Hence, plucking a string can be a source of sound through vibrations

- Plucking a string can be a source of sound through vibrations
- A source of something emits / produces / generates / provides that something
- Therefore, plucking a string can produce sound through vibrations

Therefore, plucking a string can produce sound through vibrations
[Question]When a guitar string is plucked, sound is produced by
[Context]- A source of something emits / produces / generates / provides that something 
- Vibrations are a source of sound 
- Plucking a string can cause that string to vibrate