Cuneiform (from Latin cuneus meaning wedge) was the writing system used in ancient Mesopotamia. Scribes pressed a reed stylus into wet clay tablets to create wedge-shaped marks representing words and sounds. A Mesopotamian wedge-shaped writing system fits that evidence because it matches the specific chronology, agency and function contained in the question. A comparison with the alternatives is useful: An ancient Egyptian burial ritual, A type of ancient Greek pottery and An Indus Valley seal script are genuine historical terms or names, but each belongs to a different office, patron, text, region or sequence. The compact memory link is therefore A Mesopotamian wedge-shaped writing system together with the factual context above, not the isolated option letter.