Which of these is a properly structured argument?

a) william shakespeare's plays remain popular and relevant centuries after the playwright's death, a
testament to shakespeare's status as the greatest
writer in human history.

b) william shakespeare is the greatest writer in human
history. not only do his works remain relevant four
hundred years after his death, but those works
changed the english language forever.

c) william shakespeare's plays introduced phrases such
as "one fell swoop" and "foregone conclusion" that are still commonly used today. that’s why he is the greatest writer in human history.

d) william shakespeare is the greatest writer in human history. his works permanently changed the english language by introducing phrases such as “one fell swoop” and “foregone conclusion” that are now considered common usage.