Which sentence contains an incorrectly punctuated appositive or appositive phrase?
a.
sarah smith, the first person from our town to attend yale, is giving a speech at the meeting.
b.
were the writers ernest hemingway and gertrude stein ever photographed together?
c.
science fiction writer orson scott card is very talented.
d.
one hero in the animation field is mel blanc the voice behind many cartoon characters.