单选题All of Mark's former students go to college. If the statement above is true, which of the following must also be true?A If Ethan was not Mark's student, then he is not going to college.B If Joyelle goes to college, then she was not Mark's student.C If

If Ethan was not Mark's student, then he& is not going to college.

If Joyelle goes to college, then she was& not Mark's student.

If Ginger goes to college, then she was& Mark's student.

If Stephanie was Mark's student, then& she is not going to college.

If Steve does not go to college, then he& was not Mark's student.