How do you think Strings instruments make sound?

A.
There is a small piece of wood called a "reed" that vibrates to make sound.

B.
Players vibrate their lips and blow air into a mouth piece

C.
Parts of the instrument must be plucked, strummed, or bowed to make vibration.

D.
Vibrations are made by striking, scraping, or shaking the instrument.

These traits are all equally important in recognizing the validity of artwork mainly due to an artists' consistent style and reputation which they have developed over a lengthy period of time. most famous paintings contain specific characteristics of the artist who created it. an appraiser would pay close attention to certain key elements within the painting, as well as an accuracy in measurement and color shade. blended textures and outlines are essential in recognizing an authentic piece from a copy. signature and imagery exist in epic proportions to balance out each trait as they coexist in harmony, depending on preference and style of each artist. no two original pieces are virtually identical, although it may be almost impossible to see discrepancy with the naked eye.

Ithink is is c (ts-ang chieh) but not completely