Answer:
Da Vinci was the world’s greatest genius.
Step-by-step explanation:
This is the statement that best shows the bias of the writer. The statement is presented as a fact. However, there is little evidence to back this up. Moreover, despite the evidence, it is impossible to establish who the world's greatest genius was. Therefore, the author is presenting an opinion, and by stating it so confidently he is showing that he does not have an objective perspective on the subject.