Journalist: The new mayor is undeniably bold. His assertions are made with utter certainty and confidence. While these kinds of assertions may make him popular with the public, they also demonstrate that he is not an introspective person. Which one of the following is an assumption required by the journalist's argument? ['Politicians who are not bold are unpopular with the public.', 'People who are bold make public assertions with utter certainty and confidence.', 'Politicians who make assertions with utter certainty and confidence are popular with the public.', 'Introspective people do not make assertions with utter certainty and confidence.']