It is important to cultivate the aesthetic taste of design students, so schools should offer Chinese and Western art history courses for design students. If the following options are true, what will most weaken the conclusion? ['There is no significant difference in aesthetic taste between students who have taken Chinese and Western art history courses and those who have not taken them.', 'Whether there is aesthetic interest has little to do with whether students can design excellent works.', "The degree of student's hard work in the course is proportional to the exquisiteness of the designed work.", 'Not all students who have taken Chinese and Western art history courses can become outstanding designers.']