Which sentence does not contain any errors in comma usage?

a.
the statue of liberty was built in paris france.

b.
until december 18 2013, my address will be 3402 glen carlyn drive, falls church va 22041.

c.
my aunt's birthday is june 4 1968.

d.
if you ever tour philadelphia, pennsylvania, be sure to stop by the liberty bell.

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.

Which statement best completes its flow of reasoning

How do i correct this sentence correctly?