A doctoral supervisor said: Now that the doctoral dissertation, the sentences are getting more and more difficult to understand, the Ph. D. thesis entrusted to me by the current students are written very poorly, the sentences are incomprehensible, and there are many typos. Which of the following options will most weaken the argument of this college mentor? ? ['The above argument does not prove that the doctoral supervisor can judge the writing level of doctoral students.', 'Whether the student level of this doctoral supervisor can represent the level of all doctoral students needs to be confirmed.', 'The argument above does not exclude the possibility that the doctoral supervisor is not a good teacher.', 'Negative arguments are not provided in the discussion above.']