Recourse to authority refers to the logical fallacy of the argument without analysing quotes from authoritative persons as a sufficient argument for the validity of the argument. Which of the following () statement contains the error of "recourse to authority". ['For well-known scientists, the government and society always give them various titles, reputations and various favorable treatments.', 'A principal said: "The logic of boys and girls is different, a well-known professor has always said so".', 'Xiao Wang wants to apply for a doctoral candidate in the direction of ancient Chinese literature. Professor Zhang, a famous expert in ancient Chinese literature, wrote a letter of recommendation for him.', "As an authority in the field of nuclear physics, Researcher Wang, the representative of the National People's Congress, accepted an interview on food safety. In the interview, he repeatedly emphasized that his opinions on food safety are merely personal opinions."]