Analyst: A recent survey showed that although professors of biology who teach but do not pursue research made up one twentieth of all science professors, they were appointed to fewer than one twentieth of all the scientific administrative positions in universities. We can conclude from this survey that failing to pursue research tends to bias university administrators against appointing these professors to scientific administrative positions. Which one of the following, if true, most seriously weakens the support for the analyst's conclusion? ['Biologists who hold scientific administrative positions in the university tend to hold those positions for a shorter time than do other science professors.', 'Biology professors get more than one twentieth of all the science grant money available.', 'Conducting biological research tends to take significantly more time than does teaching biology.', 'Biologists who do research fill a disproportionately low number of scientific administrative positions in universities.']