Sentence:Guitars are played acoustically; the [e1]tone[/e1] is produced by the [e2]vibration[/e2] of the strings which is amplified by the body of the guitar, which acts as a large hollow resonating chamber, or they may rely on an amplifier that can electronically manipulate tone.
 e1: tone. 
 e2 : vibration.
Answer: Cause-Effect(e2,e1)