A retired teacher said, "The teacher likes the student with the best grades, and I do the same. Now when I look back on more than 30 years of a teaching career, I find that a student's performance is not equal to his future career success. Some of the students did very well when they were studying, and some of them succeeded in their careers later, but none of the students with the best results in that year later succeeded in their careers. ". If what the teacher said is true, which of the following must also be true? ["The teacher's favorite student was not very successful in his career.", "Some of the students who were very successful in their careers were some of the teachers' least favorite.", "Of the teacher's students, the worst grade in the year was not successful in their careers.", "Any teacher's favorite student will not be successful in his career after graduation."]