I had to attend a class seminar this morning , which was being held in downtown Norfolk . The only time I ever go downtown is for a concert , theater show , or a trip to the overly expensive mall , and that 's quite rare . I drove all around looking for the street the college campus was on , but could n't find it .

Question: Why did you have to attend a class seminar this morning ?
Answer: None of the above choices .I had to attend a class seminar this morning because I need to take the class in order to graduate .I had to attend a class seminar this morning because we were having a semester exam on that day .I had to attend a class seminar this morning because it is being taught by my favorite college professor .