At Tromen University this semester, some students taking French Literature 205 are also taking Biology 218. Every student taking Biology 218 at Tromen is a biology major. Ttherefore, some of the students taking French Literature 205 are not French-literature majors. The conclusion drawn above follows logically if which one of the following is assumed to be true at Tromen University? ['It is not possible to major in both biology and French literature.', 'There are more biology majors than there are French-literature majors.', 'French Literature 205 is a required course for French-literature majors.', 'Only biology majors are allowed to take Biology 218.']