Which sentence contains an incorrectly punctuated appositive or appositive phrase?

ASarah Smith, the first person from our town to attend Yale, is giving a speech at the meeting.
BWere the writers Ernest Hemingway and Gertrude Stein ever photographed together?
CScience fiction writer Orson Scott Card is very talented.
DOne hero in the animation field is Mel Blanc the voice behind many cartoon characters.

Verified Answer :

The last sentence is incorrectly punctuated, that is, it actually has no punctuation whatsoever (apart from the full stop). It should say - One hero in the animation field is Mel Blanc, the voice behind many cartoon characters. 
A comma was missing.