Can anyone answer this question?

I read an interesting theory on how stringed instruments were first created.

An ancient hunter went bow hunting to procure a meal. The hunter noticed that when he pulled back on the bow’s string and released it, the string made a sound that he liked. He discovered that a tight string made a higher pitched sound, and a string that was more loose made a deeper sound.
He went back to his cave, and attached a string to a piece of wood. He learned that by plucking the string, and holding one finger down on the string against the wood (fretboard) at different intervals, he was able to sequence together a pleasing collection of sounds. He played his single stringed bow for awhile, then he added a second string. He was able to produce even more sounds with his two stringed bow.

This sound maker didn’t help him with hunting, starting fires, or finding a bigger cave to live in. He just liked making sounds, and a few of the other cavemen and cavewomen liked listening to his sounds. They enjoyed the sounds coming from the two stringed bow attached to a piece of wood, it seemed to resonate with them on some primordial level.

After some time had passed someone made a four stringed sound making device. It was called a lute. Then two more strings were added, and they called it a guitar.

That’s the story, but no one really knows for sure. It seems plausible though.