Egyptian sculptors sometimes used sunken relief rather than bas-relief because of all of the following except:
a) sunken reliefs preserve the contours of the surfaces being carved so that columns still look round
b) sunken reliefs are easier to carve, a necessity because egyptians used soft bronze-age tools to carve into hard stones like greywacke
c) sunken reliefs hide the function of columns as supporting elements, emphasizing instead their images and messages
d) sunken reliefs cast deep shadows so that the images can be read more clearly in the Egyptian sun
Answer: B