Marking brainlist

which sentence contains correctly punctuated items in a series? a. the hardest state capitals for me to remember are austin, texas; montgomery, alabama; and bismarck, north dakota. b. the hardest state capitals for me to remember are austin, texas, montgomery, alabama, and bismarck, north dakota. c. the hardest state capitals for me to remember are austin texas, montgomery alabama, and bismarck north dakota. d. the hardest state capitals for me to remember are austin; texas, montgomery; alabama, and bismarck; north dakota.