Pls hurry "The creation of a mosaic was a complicated procedure that called for careful timing and teamwork..
Walls were painted with resin or tar before being covered with the first of three layers of plaster. ... A
sketch of the projected work was then made on the plaster to serve as a guide for the various artisans.
The outermost layer of pilaster, in which the pieces, or tesserae, of the mosaic would be set, was spread
on only enough area to contain a day's work. Some of the tesserae—small, carefully cut fragments of
colored glass, marble, and semiprecious stones were pressed into the wet plaster so that they
projected at a slight angle. The stones thereby better reflected light and imbued the finished mosaic
with a shimmering life of its own."
--Empires Besieged: Time Frame AD. 200-600
a.
How many layers of materials were under the tiles?
two
C. four
b. three
d. five