Which is the best example of notes from the supporting detail shown here? supporting detail: they needed some way to keep track of what they owned. sumerians the greatest gift the sumerians gave the world was the invention of writing. the sumerians were a wealthy people. they needed some way to keep track of what they owned. they began drawing pictures. they used a reed as a pen. they drew on soft pieces of clay. the soft clay was then dried in the sun. the tablet became a permanent record. later, the sumerian drawings changed into wedge-shaped symbols. this kind of writing is called cuneiform. by putting symbols together, the sumerians could write entire sentences. a. cuneiform was invented b. cuneiform the sumerians keep track of what they owned. c. needed to keep records