Select the clearest, most concise sentence.
a. george was really late to work due to the fact that his car broke down on the freeway while he was driving to work.
b. george was late to work because his car broke down on the freeway.
c. while george was in his car driving to work on the freeway, his car broke down, so he was late to work.

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.