Which sentence does not end with the correct punctuation mark?

A) Out of all the students that I was sure would pass the class, I can't believe that you were the one that didn't!
B) If a student passes all of her classes but does not complete her service requirement, then does she get to walk at graduation.
If you do not complete all the required core class components, then you are not going to be allowed to graduate from the program.
D) When a school sets up a formidable list of graduation requirements, it is no surprise when some students are unable to fulfill them.