Respuesta :
Answer: The right answer is the C) They needed some way to keep track of what they owned.
Explanation: Just to elaborate a little on the answer, it can be added that since the question asks WHAT the Sumerians needed to keep track of, options A and B are irrelevant, since they do not provide a precise answer — they indicate that the Sumerians were wealthy (that's, nevertheless, a clue, since wealth and ownership go hand in hand) and that they could write entire sentences by putting symbols together. Option C is, therefore, the correct alternative. The Sumerians needed to keep track of what they owned.