Final answer:
The commonality between guitar, violin, and cello is that they are all stringed instruments. They produce sound by vibrating the strings, which are either plucked or bowed. These instruments have a resonating chamber that amplifies and enriches the sound created by the vibrating strings.
Step-by-step explanation:
The commonality between guitar, violin, and cello is that they are all stringed instruments. Stringed instruments produce sound by vibrating strings. In the case of guitar, violin, and cello, the strings are plucked or bowed to produce sound. These instruments also have a similar structure with a resonating chamber, like a sounding box, that amplifies and enriches the sound created by the vibrating strings.