Which sentence does not end with the correct punctuation mark?

Responses
A Where the Wild Things Are by Maurice Sendak is one of the most popular children's books of all time?Where the Wild Things Are by Maurice Sendak is one of the most popular children's books of all time?
B Where all of the children's books were located needed to be changed so that circulation would possible increase.Where all of the children's books were located needed to be changed so that circulation would possible increase.
C Where the librarian's office is located is below the stairs on the first floor near the water fountain and statue.Where the librarian's office is located is below the stairs on the first floor near the water fountain and statue.
D Where do you think a book that is both science fiction and fantasy at the same time would be located in the library?

B Where all of the children's books were located needed to be changed so that circulation would possible increase.