Which sentence uses commas correctly?

a.
kenneth has been studying the work, of ingmar bergman a movie director.

b.
for lunch they met at art's a diner, on west street.

c.

"a blessing" was written by james wright, an american poet.

d.
lamar would like to go to haiti a country, in the west indies.

Don't hold this against me, but the most grammatically correct one, seems like C.

"A Blessing" was written by James Wright, an American poet.

Explanation:

i love cake

and don't hate

i know i'm fat

but what's wrong with that

i cant rap

but im sure ya know that

its just for fun

so quit hatin' son

~courtney

roses are red,

violets are black,

for what you said,

i hope you sit on a big fat tack.