Ithink a
which sentence does not contain any errors in comma usage?
a.
many farmers planted corn, and others planted soy beans.
b.
jeremy sent a letter in the mail, but, later that week katie replied by e-mail.
c.
the artist paints landscapes and animals and then she sells her artwork at the outdoor market.
d.
a factory recently closed in pittsburgh but, another one is opening soon.