mosaics are _____?

A. images made with glass that has been colored by metallic salts are pieced together like a collage, and are joined by leading
B. images made by arranging colored pieces on a flat surface, which are held using leading.
C. artwork created by arranging cut out or torn material pasted onto a surface. means "to glue" in French.
D. stones or tiles that are then embedded with a filler to connect the colored pieces.