Cubism was an artistic movement that focused on creating artistic pieces by using cubes and other geometrical shapes that show an object, person or landscape from different perspectives. This movement began in the 20th century and was led by artists such as Pablo Picasso. According to this, it is option C or the third picture that shows a violin the one that is an example of cubism because the violin has been painted using many cubes and geometrical shapes, which is the main feature of cubism. Besides this, the painting belongs to Pablo Picasso who was one of the leaders of this movement, as mentioned before.
