Answer:
A. adding metallic oxides to sand and ash or lime, then infusing at high temperatures
Explanation:
Usually 1 referee and 2 referee assistants. Hope this helps!
The answer is "3). It appears to have been created to mark the unification of Egypt."
It isn't 1, as the Palette of Narmer is an Egyptian artwork, not Sumerian.
It isn't 2, as it doesn't feature cuneiform, but hieroglyphs.
It isn't 4, as the art isn't Mesopotamian, but Egyptian.
