Select the most effective thesis sentence.
a. the brain is something else
b. juvenile delinquency probably results from lack of something on the part of youth
c. children in families where both parents work are statistically proven to be independent and responsible
d. skiing is my favorite hobby
i picked c is that right?

The greatest gift the sumerians gave the world was the invention of writing. the sumerians were 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.